Check if all values in array are true, then return a true boolean statement (javascript) [duplicate]

Question

You can use .every() method:

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

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

console.log(checker(arr1));
console.log(checker(arr2));

As mentioned by @Pointy, you can simply pass Boolean as callback to every():

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

let checker = arr => arr.every(Boolean);

console.log(checker(arr1));
console.log(checker(arr2));

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