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ivansnek/arrayUtils.js

Created August 13, 2019 22:01
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Array Flatten Exercise
Raw
arrayUtils.js
/*
*****************************************************************************************
* Source File
* Copyright (C) 2019 IvanSnek
*
* [CHANGE HISTORY]
* 1. 2019-Aug-13 (ivansnek) File created
*
*****************************************************************************************
*/
/**
* This helper function allows to flatten a given array e.g. [[1,2,[3]],4] -> [1,2,3,4].
* If the value provided to the function is not a valid array it will return null.
* @param {Array} values Given array to flatten
* @returns {Array} The flatten version of the given value.
*/
function flattenArray(values) {
if (Array.isArray(values)) {
return values
.join(",")
.split(",")
.map(val => parseInt(val));
}
return null;
}
module.exports = { flattenArray };
Raw
arrayUtils.test.js
/*
*****************************************************************************************
* Source File
* Copyright (C) 2019 IvanSnek
*
* [CHANGE HISTORY]
* 1. 2019-Aug-13 (ivansnek) File created
*
*****************************************************************************************
*/
const { flattenArray } = require("./arrayUtils.js");
/** Tests Values*/
const testValues1 = [1];
const testValues2 = [1, 3, 4, [23, 32]];
const testValues3 = [
[[2, 3], [[23, 23, [9, 9, [10, [10]]]]]],
1,
9,
[[23, 23, [9, 9, [10, [10]]]]],
[9, 9, [10, [10]]]
];
test("arrayUtils.flattenArray should flatten a given valid array", () => {
expect(flattenArray(testValues1)).toEqual([1]);
expect(flattenArray(testValues2)).toEqual([1, 3, 4, 23, 32]);
expect(flattenArray(testValues3)).toEqual([
2,
3,
23,
23,
9,
9,
10,
10,
1,
9,
23,
23,
9,
9,
10,
10,
9,
9,
10,
10
]);
});
test("arrayUtils.flattenArray should return null with no valid array values", () => {
expect(flattenArray("testValue")).toBeNull();
expect(flattenArray(null)).toBeNull();
expect(flattenArray(undefined)).toBeNull();
expect(flattenArray({})).toBeNull();
expect(flattenArray({ key: 1 })).toBeNull();
});
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