You can use the isArray method or instanceof operator or constructor type to Check if the variable is Array in JavaScript. The best solution is the one you have chosen.
variable.constructor === ArrayThis is the fastest method on Chrome, and most likely all other browsers. All arrays are objects, so checking the constructor property is a fast process for JavaScript engines.
Check if variable is Array JavaScript
Simple example code Array.isArray() method checks whether the passed variable is an Array object.
<!DOCTYPE html>
<html>
<body>
<script>
let arr = [10, 20, 30, 40];
var res = Array.isArray(arr);
console.log(res)
console.log(arr)
</script>
</body>
</html>
Output:
Using the instanceof operator
<script>
let data = [10, 20, 30, 40];
var res = data instanceof Array;
console.log(res)
</script>Output: true
Checking the constructor property of the variable
<script>
let data = [10, 20, 30, 40];
var res = data.constructor === Array
console.log(res)
</script>Output: true
Do comment if you have any doubts or suggestions on this JS Array topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version
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