How to compare two arrays in JavaScript ?
In this article, the task is to compare two arrays, & we need to check the length of both arrays that should be the same, the objects present in them are of the same type and each item in one array is equal to the counterpart in another array. By doing this, we can conclude both arrays are the same or not. JavaScript provides a function JSON.stringify() method in order to convert an object or array into a JSON string. By converting into JSON strings, we can directly check if the strings are equal or not.
Example 1: This example uses the JSON.stringify() method to convert an object or array into a JSON string, then accordingly check for the given condition. If it satisfies the specific condition then it returns true otherwise, it will return false.
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Javascript
<script> var a = [1, 2, 3, 5]; var b = [1, 2, 3, 5]; // Comparing both arrays using stringify if(JSON.stringify(a)==JSON.stringify(b)) document.write("True"); else document.write("False"); document.write('<br>'); var f=[1, 2, 4, 5]; if(JSON.stringify(a)==JSON.stringify(f)) document.write("True"); else document.write("False");</script> |
Output:
True False
Example 2: In this example, we manually check each and every item and return true if they are equal otherwise return false.
Javascript
<script> function isEqual() { var a = [1, 2, 3, 5]; var b = [1, 2, 3, 5]; // If length is not equal if(a.length!=b.length) return "False"; else { // Comapring each element of array for(var i=0;i<a.length;i++) if(a[i]!=b[i]) return "False"; return "True"; } } var v = isEqual(); document.write(v);</script> |
Output:
True
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