How to know if two arrays have the same values in JavaScript?

Let’s say the following are our arrays −

var firstArray=[100,200,400];
var secondArray=[400,100,200];

You can sort both the arrays using the sort() method and use for loop to compare each value as in the below code −

Example

var firstArray=[100,200,400];
var secondArray=[400,100,200];
function areBothArraysEqual(firstArray, secondArray) {
   if (!Array.isArray(firstArray) || ! Array.isArray(secondArray) ||
   firstArray.length !== secondArray.length)
   return false;
   var tempFirstArray = firstArray.concat().sort();
   var tempSecondArray = secondArray.concat().sort();
   for (var i = 0; i < tempFirstArray.length; i++) {
      if (tempFirstArray[i] !== tempSecondArray[i])
         return false;
   }
   return true;
}
if(areBothArraysEqual(firstArray,secondArray))
console.log("Both are equals");
else
console.log("Both are not equals");

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo156.js.

Output

PS C:\Users\Amit\JavaScript-code> node demo156.js
Both are equals