js 模拟扩展 c# 的 linq 表达式 分享 linq to js
hi ：如下是 linq to js 的分享 ，，如有雷同 纯属巧合
(function () {
Array.prototype.first = function (predicate, def) {
var l = this.length;
if (!predicate) return l ? this[0] : def == null ? null : def;
for (var i = 0; i < l; i++)
if (predicate(this[i], i, this))
return this[i];
return def == null ? null : def;
};
Array.prototype.where = Array.prototype.filter || function (predicate, context) {
context = context || window;
var arr = [];
var l = this.length;
for (var i = 0; i < l; i++)
if (predicate.call(context, this[i], i, this) === true) arr.push(this[i]);
return arr;
};
Array.prototype.select = Array.prototype.map || function (selector, context) {
context = context || window;
var arr = [];
var l = this.length;
for (var i = 0; i < l; i++)
arr.push(selector.call(context, this[i], i, this));
return arr;
};
})();
使用要领：list.first(function (t) { return t.Value.trim() == city.trim(); });
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