Here you can find the source of none(predicate)
Array.prototype.none = function(predicate){ for (var i = 0; i < this.length; i++){ if (predicate(this[i])) { return false }/*from w w w .j ava 2 s . c om*/ } return true }
Array.prototype.none = function (p) { for(var i = 0; i < this.length; i++){ if(p(this[i])) return false; return true; };
Array.prototype.none = function (p) { return this.filter(p).length == 0; };
Array.prototype.none = function (p) { for (i = 0; i < this.length; i++) if (p(this[i])) return false; return true; };
Array.prototype.none = function (p) { for(let el of this){ if(p(el)) {return false;} return true; };
Array.prototype.none = function (p) { for (var i = 0; i <this.length; i++){ if (p(this[i]) === true){ return false; return true; };