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thedgbrt/flatten.js

Created February 2, 2017 00:05
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  1. thedgbrt created this gist Feb 2, 2017.
    23 changes: 23 additions & 0 deletions flatten.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,23 @@
    function flatten(arr){
    var flatArr = [];

    var recursive = function(arr2) {
    if(arr2.length == 0) {
    return;
    } else if (Array.isArray(arr2[0])) {
    recursive(arr2[0]);
    } else {
    flatArr.push(arr2[0]);
    }
    recursive(arr2.slice(1));
    }

    recursive(arr);
    return flatArr;
    }

    var test1 = JSON.stringify(flatten([])) === JSON.stringify([]);
    var test2 = JSON.stringify(flatten([1])) === JSON.stringify([1]);
    var test3 = JSON.stringify(flatten([[1,2]])) === JSON.stringify([1,2]);
    var test4 = JSON.stringify(flatten([[1,2],3])) === JSON.stringify([1,2,3]);
    var test5 = JSON.stringify(flatten([[1,2,[3]],4])) === JSON.stringify([1,2,3,4]);