prototype.js分析 Enumerable

JavaScript

any ある要素が条件を満たしているか

<script>
Array.prototype._each = function(iterator){
	for(var i=0, l=this.length; i<l; i++){
		iterator(this[i]);
	}
};

Array.prototype.each = function(iterator){
	var index = 0;
	try{
		this._each(function(v){
			iterator(v, index++);
		});
	} catch(e){
		if(e != $break) throw e;
	}
};

Array.prototype.any = function(iterator){
	var rs = false;
	this.each(function(v, k){
		if(rs = !!iterator(v, k))
		throw $break;
	});
	return rs;
};

var $break = {};

var kekka = [1, 2, 3, 4].any(function(v, k){
	return (typeof(v) === 'string');
});
console.log(kekka);
</script>