Revisions to How to check if two arrays are equal with JavaScript? [duplicate]

Using != instead of !== can cause unexpected type-coercion and lead to errors / bugs.

edited Jun 18, 2020 at 21:49

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This is what you should do. DoPlease do not use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length !== b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. // Please note that calling sort on an array will modify that array. // you might want to clone your array first. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

This is what you should do. Do not use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length !== b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. // Please note that calling sort on an array will modify that array. // you might want to clone your array first. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

This is what you should do. Please do not use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length !== b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. // Please note that calling sort on an array will modify that array. // you might want to clone your array first. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

Using != instead of !== can cause unexpected type-coercion and lead to errors / bugs.

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edit approved Jun 18, 2020 at 21:49

aeronaut

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This is what you should do. Please don'tDo not use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length !=== b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. // Please note that calling sort on an array will modify that array. // you might want to clone your array first. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

This is what you should do. Please don't use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length != b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. // Please note that calling sort on an array will modify that array. // you might want to clone your array first. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

This is what you should do. Do not use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length !== b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. // Please note that calling sort on an array will modify that array. // you might want to clone your array first. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

more info added.

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edit approved Sep 22, 2018 at 19:56

StackedQ

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This is what you should do. Please don't use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length != b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here.  // Please note that calling sort on an array will modify that array. // you might want to clone your array first.  for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

This is what you should do. Please don't use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length != b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here. for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }

This is what you should do. Please don't use stringify nor < >.

function arraysEqual(a, b) { if (a === b) return true; if (a == null || b == null) return false; if (a.length != b.length) return false; // If you don't care about the order of the elements inside // the array, you should sort both arrays here.  // Please note that calling sort on an array will modify that array. // you might want to clone your array first.  for (var i = 0; i < a.length; ++i) { if (a[i] !== b[i]) return false; } return true; }