I have these two arrays: one is filled with information from an ajax request and another stores the buttons the user clicks on. I use this code (I filled with sample numbers):
var array1 = [2, 4]; var array2 = [4, 2]; //It cames from the user button clicks, so it might be disordered. array1.sort(); //Sorts both Ajax and user info. array2.sort(); if (array1==array2) { doSomething(); }else{ doAnotherThing(); }
But it always gives false
, even if the two arrays are the same, but with different name. (I checked this in Chrome’s JS Console). So, is there any way I could know if these two arrays contain the same? Why is it giving false
? How can I know which values in the first array are not in the second?
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Answer
Sort the arrays and compare their values one by one.
function arrayCompare(_arr1, _arr2) { if ( !Array.isArray(_arr1) || !Array.isArray(_arr2) || _arr1.length !== _arr2.length ) { return false; } // .concat() to not mutate arguments const arr1 = _arr1.concat().sort(); const arr2 = _arr2.concat().sort(); for (let i = 0; i < arr1.length; i++) { if (arr1[i] !== arr2[i]) { return false; } } return true; }