Convert a nested number array into an one-dimensional array.

RecursivelyNestedArrayFix.js

#!/usr/bin/env node
/**
 * Simple conversor from a nested number array into an one-dimensional array.
 * Made for citrusbyte code test
 * Jordan L. Araujo Jr. - jordanjr.92@gmail.com
 * 15/12/2018
 */


//run test cases
testCases();

/**
 * Recursively enter in a nested array and put
 * the numbers inside an one-dimensional array
 * @param nestedArray nested Array that you want to fix
 * @param resultArr the result numbers of the nested array into an one-dimensional array
 * @returns an one-dimensional array with all the numbers of the nested array in order
 */
function recursivelyNestedArrayFix(nestedArray, resultArr) {
    if (nestedArray.length !== 0) {
        for (let arrElement of nestedArray) {
            if (typeof arrElement === 'number') {
                resultArr.push(arrElement)
            } else {
                recursivelyNestedArrayFix(arrElement, resultArr);
            }
        }
    }
    return resultArr
}

/**
 * Run 10 test cases with some possible break values
 */
function testCases() {
    let test1 = [[1, 2, [3]], 4];
    let test2 = [[1, 2, [3, 4, 5]], 6];
    let test3 = [[[1], 2, [3]], 4, [5, [6]]];
    let test4 = [];
    let test5 = [[[[[[[[[[[[[[[1]]]], 2]]]]], 3]]]]], 4];
    let test6 = [1, [2], 3, [4], 5];
    let test7 = [[1], [2], [3], [4]];
    let test8 = [[1, 2, [3]], 4];
    let test9 = [1, 2, 3, 4];
    let test10 = [[[[[[[[[[[[[[[[[[[[[1]]]]]]]]]]]]]]]]]]]]];

    console.log(JSON.stringify(test1) + '->' + JSON.stringify(recursivelyNestedArrayFix(test1, [])));
    console.log(JSON.stringify(test2) + '->' + JSON.stringify(recursivelyNestedArrayFix(test2, [])));
    console.log(JSON.stringify(test3) + '->' + JSON.stringify(recursivelyNestedArrayFix(test3, [])));
    console.log(JSON.stringify(test4) + '->' + JSON.stringify(recursivelyNestedArrayFix(test4, [])));
    console.log(JSON.stringify(test5) + '->' + JSON.stringify(recursivelyNestedArrayFix(test5, [])));
    console.log(JSON.stringify(test6) + '->' + JSON.stringify(recursivelyNestedArrayFix(test6, [])));
    console.log(JSON.stringify(test7) + '->' + JSON.stringify(recursivelyNestedArrayFix(test7, [])));
    console.log(JSON.stringify(test8) + '->' + JSON.stringify(recursivelyNestedArrayFix(test8, [])));
    console.log(JSON.stringify(test9) + '->' + JSON.stringify(recursivelyNestedArrayFix(test9, [])));
    console.log(JSON.stringify(test10) + '->' + JSON.stringify(recursivelyNestedArrayFix(test10, [])));

}