Question

I have

x = [false, false, true, true, false]

I want a function that returns true if there’s at least one true in the array, like this: http://jsfiddle.net/7uVWk/

x = [false, false, true, true, false];

function hasTrue(x) {
  result = false;
  ​for (var i=0; i <​x.length; i++) {
    result = result || x[i];
  }
}  
document.write(hasTrue(result));

How can I achieve this result more succinctly?

Answer 1

Using Array.prototype.some (I did not write a separate function, because this syntax does already make much sense):

var x = [false, false, true, true, false];
x.some(function(val) {
    return val === true;
}); // true or false. In this case, true