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JavaScript - check if arrays are identical
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In this article, we would like to show you how to check if arrays are identical in JavaScript.
To check if arrays are identical we take the following steps:
- Check if the
lengthof both arrays is the same (if it's not they are different), - iteratively check each element to find out if they are equal.
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function areEqual(array1, array2) {2
if (array1 === array2) {3
return true;4
}5
if (array1.length !== array2.length) {6
return false;7
}8
for (var i = 0; i < array1.length; ++i) {9
if (array1[i] !== array2[i]) return false;10
}11
return true;12
}13
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// Usage example16
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console.log(areEqual([1, 2, 3], [1, 2, 3])); // true18
console.log(areEqual([1, 2, 3], [3, 2, 1])); // falseIn this section, we've used JavaScript modern syntax.
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const areEqual = (array1, array2) => {2
if (array1 === array2) return true;3
if (array1.length !== array2.length) return false;4
5
for (let i = 0; i < array1.length; ++i) {6
if (array1[i] !== array2[i]) return false;7
}8
return true;9
};10
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// Usage example13
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console.log(areEqual([1, 2, 3], [1, 2, 3])); // true15
console.log(areEqual([1, 2, 3], [3, 2, 1])); // false