How to check if all values in array are true in JavaScript

In this short article, we will show you how to check if all values in an array are true then return a true boolean statement in JavaScript.

Let’s assume that we have the following array of booleans.

var arr1 = [true, false, true];
var arr2 = [true, true, true];

In the above code, the value of arr1 should be false as one item in the list is false while the value of arr2 should be true because all items are true.

We can use the every() method to get the desired output.

var arr1 = [true, false, true];
var arr2 = [true, true, true];

let myFunction = arr => arr.every(v => v === true);

myFunction(arr) {
  return arr.every(v => v === true);
}

console.log(myFunction(arr1)); // Output: false
console.log(myFunction(arr2)); // Output: true

We can simply pass the Boolean as a callback to every() method.

myFunction(arr) {
  return arr.every(Boolean);
}

That’s it for today.
Thank you for reading. Happy Coding..!! 🙂