demo 例子.. $ 在字符串中代表當前循環(huán)對象 var arr = linq.from(this.list).select(function (v) {var goodsList = v['goodsList'];var res = linq.from(goodsList).where('$.checked==1').select(function (v) {return {'id': v['id'], 'buy_number': v['buy_number']};}).toArray();if (res == undefined || res.length == 0) {return null;}return res;}).where(' $!=null && $.length>0 ').toArray();

gitHub:

https://github.com/mihaifm/linq

?

?

var Enumerable = require('../linq');///// //first step of Lambda Expression console.log('\nfirst step of Lambda Expression\n');// Anonymous function Enumerable.range(1, 3).select(function(value, index) { return index + ':' + value }).log().toJoinedString(); // String like Lambda Expression (arguments => expression) Enumerable.range(1, 3).select((value, index) => index + ':' + value).log().toJoinedString();// If the number of arguments is one , can use default iterator variable '$' Enumerable.range(1, 3).select(i => i * 2).log().toJoinedString(); Enumerable.range(1, 3).select("$*2").log().toJoinedString(); // same// "" is shortcut of "x => x" (identity function) Enumerable.range(4, 7).join(Enumerable.range(8, 5), "", "", (outer, inner) => outer * inner).log().toJoinedString();///// //Scope of lambda expression console.log('\nScope of lambda expression\n');var number = 3; // Can't Find number | lambda expression can use only global variable // Enumerable.range(1,10).where("$ == number").log().toJoinedString();// use anonymous founction, can capture variable Enumerable.range(1,10).where(function(i){return i == number}).log().toJoinedString();// //from(Object) -> convert to keyvaluePair console.log('\nfrom(Object) -> convert to keyvaluePair\n');var object = {foo:"a", "bar":100, "foobar":true}; Enumerable.from(object).forEach(function(obj) {console.log(obj.key + ":" + obj.value); });// //forEach (continue and break) console.log('\nforEach (continue and break)\n');Enumerable.repeat("foo", 10).forEach(function(value, index) {if (index % 2 == 0) return; // continueif (index > 6) return false; // breakconsole.log(index + ":" + value); });///// //Grouping and ref/value compare console.log('\nGrouping and ref/value comparen\n');// ref compare console.log((new Date(2000, 1, 1) == new Date(2000, 1, 1))); // false console.log(({ a: 0} == { a: 0 })); // false console.log("------"); var objects = [{ Date: new Date(2000, 1, 1), Id: 1 },{ Date: new Date(2010, 5, 5), Id: 2 },{ Date: new Date(2000, 1, 1), Id: 3 } ]// ref compare, can not grouping Enumerable.from(objects).groupBy("$.Date", "$.Id",function (key, group) { return { date: key, ids: group.toJoinedString(',')} }).log("$.date + ':' + $.ids").toJoinedString();console.log("------");// use fourth argument(compareSelector) Enumerable.from(objects).groupBy("$.Date", "$.Id",function (key, group) { return { date: key, ids: group.toJoinedString(',')} },function (key) { return key.toString() }).log("$.date + ':' + $.ids").toJoinedString();// //Regular Expression matches console.log('\nRegular Expression matches\n');// Enumerable.matches return Enumerable<MatchObject>var input = "abcdefgABzDefabgdg"; Enumerable.matches(input, "ab(.)d", "i").forEach(function(match) {for (var prop in match){console.log(prop + " : " + match[prop]);}console.log("toString() : " + match.toString());console.log("---"); });// //LazyEvaluation and InfinityList console.log('\nLazyEvaluation and InfinityList\n');// first radius of circle's area over 10000 var result = Enumerable.toInfinity(1).where(r => r * r * Math.PI > 10000).first(); console.log(result);///// //Dictionary console.log('\nDictionary\n');// sample class var cls = function (a, b) {this.a = a;this.b = b; } var instanceA = new cls("a", 100); var instanceB = new cls("b", 2000);// create blank dictionary var dict = Enumerable.empty().toDictionary(); // create blank dictionary(use compareSelector) var dict = Enumerable.empty().toDictionary("","",function (x) { return x.a + x.b });dict.add(instanceA, "zzz"); dict.add(instanceB, "huga"); console.log(dict.get(instanceA)); // zzz console.log(dict.get(instanceB)); // huga// enumerable (to keyvaluePair) dict.toEnumerable().forEach(function (kvp) {console.log(kvp.key.a + ":" + kvp.value); });///// //Nondeterministic Programs console.log('\nNondeterministic Programs\n');// from Structure and Interpretation of Computer Programs 4.3.2 var apart = Enumerable.range(1, 5); var answers = apart.selectMany(function(baker){ return apart.selectMany(function(cooper){ return apart.selectMany(function(fletcher){ return apart.selectMany(function(miller){ return apart.select(function(smith){ return {baker: baker, cooper: cooper, fletcher: fletcher, miller: miller, smith: smith}})})})})}).where(function(x){ return Enumerable.from(x).distinct("$.value").count() == 5 }).where("$.baker != 5").where("$.cooper != 1").where("$.fletcher != 1 && $.fletcher != 5").where("$.miller > $.cooper").where("Math.abs($.smith - $.fletcher) != 1").where("Math.abs($.fletcher - $.cooper) != 1");answers.selectMany("").log("$.key + ':' + $.value").toJoinedString();

?

轉(zhuǎn)載于:https://www.cnblogs.com/whm-blog/p/9012442.html

總結(jié)

以上是生活随笔為你收集整理的linq.js的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。