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‎lodash-task/_.js

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//This file is my code
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const _ = {
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clamp(number,lower,upper){
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/*
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if(number < lower){
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return lower;
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}else if(number > upper){
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return upper;
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}else{
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return number;
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}
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*/
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//return Math.min(Math.max(number,lower),upper);
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},
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inRange(number,start,end){
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if(end===undefined){
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end = start;
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start = 0;
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}
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if(start > end){
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let temp = start;
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start = end;
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end = temp;
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}
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//console.log(`is ${number} between ${start} and ${end} inclusive?`)
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return (number >= start && number < end) ? true : false;
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},
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words(string){
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return string.split(' ');
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},
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pad(string,length){
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while(string.length<length){
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let dif = length - string.length;
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if(dif >= 2){
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string = ` ${string} `
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}
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else if (dif = 1)
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{
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string = `${string} `
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}
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}
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return string;
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},
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has(obj,key){
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let val = obj[key]
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return (val === undefined) ? false : true;
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},
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invert(obj){
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const newObj = {}
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for(const [key,value] of Object.entries(obj)){
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newObj[value] = key
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}
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return newObj;
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},
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findKey(obj,func){
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for(const[key,value] of Object.entries(obj)){
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if(func(value)){
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return key;
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}
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}
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return undefined;
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},
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drop(arr,num=1){
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for(let i = num;i>0;i--){
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arr.shift()
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}
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return arr;
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},
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dropWhile(arr,func){
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for(let i = 0;i<arr.length;i++){
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if(!func(arr[i],i,arr))
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{
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return this.drop(arr,i);
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}
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}
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},
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chunk(arr,size=1){
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let newArr = []
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for(let i = 0;i < arr.length;i+=size){
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newArr.push(arr.slice(i,i+size))
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}
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return newArr;
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}
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};
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// Do not write or modify code below this line.
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module.exports = _;

‎lodash-task/test/assert.js

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const assert = {
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testBlockTestCounts: {},
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beginTestBlock(testName) {
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this.testBlockTestCounts[testName] = 0;
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console.log(`${testName} Tests:`);
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// console.group(); - Not currently supported by LE Node version
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},
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endTestBlock() {
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// console.groupEnd(); - Not currently supported by LE Node version
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},
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terminateTestBlock() {
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console.log('Terminating tests...');
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this.endTestBlock();
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},
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incrementTestNumber(testName) {
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this.testBlockTestCounts[testName] += 1;
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return this.testBlockTestCounts[testName];
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},
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exists(testName, functionString, value) {
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const testNumber = this.incrementTestNumber(testName);
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if (value) {
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console.log("\x1b[32m%s\x1b[0m", `${testNumber} - ${functionString} is defined - Passed!`);
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} else {
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console.log("\x1b[31m%s\x1b[0m", `${testNumber} - ${functionString} is defined - Failed: ${functionString} was not properly defined.`);
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}
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},
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equals(testName, description, functionString, actualValue, expectedValue) {
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const testNumber = this.incrementTestNumber(testName);
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if (actualValue === expectedValue) {
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console.log("\x1b[32m%s\x1b[0m", `${testNumber} - ${description} - Passed!`);
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} else {
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console.log("\x1b[31m%s\x1b[0m", `${testNumber} - ${description} - Failed: ${functionString} returned ${actualValue} instead of ${expectedValue}.`);
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}
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},
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arrayEquals(testName, description, functionString, actualValue, expectedValue) {
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const testNumber = this.incrementTestNumber(testName);
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if (arraysAreEqual(actualValue, expectedValue)) {
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console.log("\x1b[32m%s\x1b[0m", `${testNumber} - ${description} - Passed!`);
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} else {
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console.log("\x1b[31m%s\x1b[0m", `${testNumber} - ${description} - Failed: ${functionString} returned ${arrayToString(actualValue)} instead of ${arrayToString(expectedValue)}.`);
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}
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},
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};
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function arrayToString(array) {
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return `[ ${array.join(', ')} ]`;
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}
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function arraysAreEqual(array1, array2) {
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const sortedArray2 = array2.sort();
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return array1.length === array2.length &&
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array1.sort().every((array1value, index) => {
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array2Value = sortedArray2[index];
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if (isArray(array1value) && isArray(array2Value)) {
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return arraysAreEqual(array1value, array2Value);
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} else {
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return array1value === array2Value;
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}
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});
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}
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function isArray(array) {
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return Object.prototype.toString.call(array) === '[object Array]';
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}
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module.exports = assert;

‎lodash-task/test/chunk.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.chunk()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.chunk()', _.chunk);
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if (!_.chunk) {
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assert.terminateTestBlock();
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return;
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}
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assert.equals(TEST_NAME, 'Returns an array', '_.chunk([1, 2, 3, 4], 2)', Object.prototype.toString.call(_.chunk([1, 2, 3, 4], 2)), '[object Array]');
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if (Object.prototype.toString.call(_.chunk([1, 2, 3, 4], 2)) !== '[object Array]') {
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assert.terminateTestBlock();
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return;
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}
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assert.arrayEquals(TEST_NAME, 'Chunks evenly-divided arrays', '_.chunk([1, 2, 3, 4], 2)', _.chunk([1, 2, 3, 4], 2), [[1, 2], [3, 4]]);
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assert.arrayEquals(TEST_NAME, 'Chunks unevenly-divided arrays', '_.chunk([1, 2, 3, 4, 5], 2)', _.chunk([1, 2, 3, 4, 5], 2), [[1, 2], [3, 4], [5]]);
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assert.endTestBlock();

‎lodash-task/test/clamp.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.clamp()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.clamp()', _.clamp);
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if (!_.clamp) {
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assert.terminateTestBlock();
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return;
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}
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assert.equals(TEST_NAME, 'Returns in-range values unmodified', '_.clamp(2, 1, 3)', _.clamp(2, 1, 3), 2);
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assert.equals(TEST_NAME, 'Clamps values by lower bound', '_.clamp(0, 1, 3)', _.clamp(0, 1, 3), 1);
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assert.equals(TEST_NAME, 'Clamps values by upper bound', '_.clamp(5, 1, 3)', _.clamp(5, 1, 3), 3);
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assert.endTestBlock();

‎lodash-task/test/drop-while.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.dropWhile()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.dropWhile()', _.dropWhile);
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if (!_.dropWhile) {
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assert.terminateTestBlock();
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return;
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}
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const indexIsSmallerThanElement = (element, index) => index < element;
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assert.equals(TEST_NAME, 'Returns an array', '_.dropWhile([1, 2, 0, 4], indexIsSmallerThanElement)', Object.prototype.toString.call(_.dropWhile([1, 2, 0, 4], indexIsSmallerThanElement)), '[object Array]');
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if (Object.prototype.toString.call(_.dropWhile([1, 2, 0, 4], indexIsSmallerThanElement)) !== '[object Array]') {
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assert.terminateTestBlock();
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return;
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}
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assert.arrayEquals(TEST_NAME, 'Drops elements until predicate function returns falsy', "_.dropWhile([1, 2, 0, 4], indexIsSmallerThanElement", _.dropWhile([1, 2, 0, 4], indexIsSmallerThanElement), [0, 4]);
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assert.endTestBlock();

‎lodash-task/test/drop.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.drop()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.drop()', _.drop);
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if (!_.drop) {
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assert.terminateTestBlock();
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return;
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}
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assert.equals(TEST_NAME, 'Returns an array', '_.drop(["hi", "bye"])', Object.prototype.toString.call(_.drop(["hi", "bye"])), '[object Array]');
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if (Object.prototype.toString.call(_.drop(["hi", "bye"])) !== '[object Array]') {
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assert.terminateTestBlock();
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return;
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}
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assert.arrayEquals(TEST_NAME, 'Drops one element if no number is specified', '_.drop(["hi", "bye"])', _.drop(["hi", "bye"]), ["bye"]);
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assert.arrayEquals(TEST_NAME, 'Drops the specified number of elements from the beginning of an array', '_.drop(["hi", "okay", "yes", "bye"], 2)', _.drop(["hi", "okay", "yes", "bye"], 2), ["yes", "bye"]);
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assert.endTestBlock();

‎lodash-task/test/find-key.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.findKey()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.findKey()', _.findKey);
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if (!_.findKey) {
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assert.terminateTestBlock();
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return;
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}
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const startsWithV = string => string.startsWith('v');
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assert.equals(TEST_NAME, 'Returns the corresponding key of a value that returns truthy from the predicate function', '_.findKey({"key": "value"}, startsWithV)', _.findKey({"key": "value"}, startsWithV), "key");
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assert.equals(TEST_NAME, 'Returns undefined if an object has no values that return truthy from the predicate function', '_.findKey({"key": "notValue"}, startsWithV)', _.findKey({"key": "notValue"}, startsWithV), undefined);
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assert.endTestBlock();

‎lodash-task/test/has.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.has()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.has()', _.has);
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if (!_.has) {
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assert.terminateTestBlock();
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return;
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}
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assert.equals(TEST_NAME, 'Returns true if an object has a value at a specified key', '_.has({"key": "value"}, "key")', _.has({"key": "value"}, "key"), true);
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assert.equals(TEST_NAME, 'Returns false if an object does not have a value at a specified key', '_.has({"key": "value"}, "notKey")', _.has({"key": "value"}, "notKey"), false);
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assert.endTestBlock();

‎lodash-task/test/in-range.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.inRange()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.inRange()', _.inRange);
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if (!_.inRange) {
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assert.terminateTestBlock();
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return;
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}
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assert.equals(TEST_NAME, 'Uses end value as start value and start value as 0 if end value is not defined', '_.inRange(1, 2)', _.inRange(1, 2), true);
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assert.equals(TEST_NAME, 'Reverses start and end values if start is bigger than end', '_.inRange(3, 4, 2)', _.inRange(3, 4, 2), true);
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assert.equals(TEST_NAME, 'Returns true if an in-range value is in range', '_.inRange(2, 1, 3)', _.inRange(2, 1, 3), true);
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assert.equals(TEST_NAME, 'Returns false if a too small value is out of range', '_.inRange(0, 1, 3)', _.inRange(0, 1, 3), false);
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assert.equals(TEST_NAME, 'Returns false if a too large value is out of range', '_.inRange(4, 1, 3)', _.inRange(4, 1, 3), false);
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assert.equals(TEST_NAME, 'Returns true if provided value is same as start value', '_.inRange(1, 1, 3)', _.inRange(1, 1, 3), true);
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assert.equals(TEST_NAME, 'Returns false if provided value is same as end value', '_.inRange(3, 1, 3)', _.inRange(3, 1, 3), false);
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assert.endTestBlock();

‎lodash-task/test/invert.js

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const _ = require('../_.js');
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const assert = require('./assert.js');
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const TEST_NAME = '_.invert()';
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assert.beginTestBlock(TEST_NAME);
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assert.exists(TEST_NAME, '_.invert()', _.invert);
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if (!_.invert) {
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assert.terminateTestBlock();
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return;
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}
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assert.equals(TEST_NAME, 'Returns an object with all keys and values inverted', '_.invert({originalKey: "originalValue"})["originalValue"])', _.invert({originalKey: "originalValue"})['originalValue'], 'originalKey');
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assert.equals(TEST_NAME, 'Returns an object with all keys and values inverted', '_.invert({originalKey: "originalValue"})["originalKey"])', _.invert({originalKey: "originalValue"})['originalKey'], undefined);
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assert.endTestBlock();

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