Problem 1

Write a function sum(arr) that accepts an array of data.

Example:

//  should return 13.2
sum([1, 'x', '2.2x', ['3', ['x2', '5']]]);

Problem 2

We have a global configuration object with nested values with unknown structure. Also we have a patch object with unknown structure.

Write a function processOverrides(o1, o2) which takes two objects and returns new object equal to o1 patched with o2 but only for keys or key sequences given in the o1["patchable"]. Result should not include patchable key/value pair itself.

Cover this function with comprehensive tests.

Example:

//  should return {'1': 2, 'a': {'3': 100}}
processOverrides({ 1: 2, a: { 3: 4 }, patchable: ["a.3"] }, { a: { 3: 100 } });