Sometimes, we want to check whether an array exists in an array of arrays with JavaScript.

In this article, we’ll look at how to check whether an array exists in an array of arrays with JavaScript.

Check Whether an Array Exists in an Array of Arrays with JavaScript

To check whether an array exists in an array of arrays with JavaScript, we can stringify both arrays with the JSON.stringify method.

Then we can use the JavaScript string indexOf method to check whether an array exists in an array of arrays by checking the stringified versions of them.

For instance, we write:

const a = [
  [1, 2],
  [3, 4]
];
const b = [1, 2];
const aStr = JSON.stringify(a);
const bStr = JSON.stringify(b);
const exist = aStr.indexOf(bStr) !== -1;
console.log(exist)

to define and a and b arrays.

Then we call JSON.stringify with a and b to return the string versions of the array.

Next, we call aStr.indexOf with bstr to check if bStr is in aStr.

And if indexOf returns anything other than -1, then we know bStr is in aStr.

Therefore, exist is true according to the console log.

Conclusion

To check whether an array exists in an array of arrays with JavaScript, we can stringify both arrays with the JSON.stringify method.

Then we can use the JavaScript string indexOf method to check whether an array exists in an array of arrays by checking the stringified versions of them.