JAVASCRIPT

js returns the number of true values there are in an array

//returns the number of true values there are in an array
function countTrue(arr) {
	return arr.filter(w => w === true).length;
}

console.log(countTrue([true, false, false, true, false]));//  2
console.log(countTrue([false, false, false, false]));//  0
console.log(countTrue([]));//  0