...alue; return y; } let splitAndReverse = compose(myReverse, mySplit); let myReduce = x => y => y.reduce(fnHandleAdd(splitAndReverse(x)), []); let fnHandleAdd = a => (accumulator, currentValue, ind...
... = item; temp++; } } return arr; } 五、myReduce //myReduce 將數(shù)組元素計(jì)算為一個(gè)值(從左到右) Array.prototype.myReduce = function(callback,initialValue){ var num = 0; if (...
... = item; temp++; } } return arr; } 五、myReduce //myReduce 將數(shù)組元素計(jì)算為一個(gè)值(從左到右) Array.prototype.myReduce = function(callback,initialValue){ var num = 0; if (...
...累加值的初始值就會(huì)是數(shù)組的第一個(gè)元素。 Array.prototype.myReduce = function(callback,init) { let acc,idx; if(init){ acc = init // 檢測(cè)我們是不是傳了init idx = 0 } else { acc = this[0] idx = 1 } for(le...
...nsole.log(myFilter);// [2, 4, 6, 8, 10, 12, 14] //reduct函數(shù) var myReduce = numbers.reduce(function(previous,current,index){ return previous + + current; }); console.log(myRedu...
...并不復(fù)雜 // callback參數(shù)有4個(gè)。pre,cur,index,arr Array.prototype.myReduce = function(callback,prev){ for(let i = 0 ; i < this.length; i++){ // 判斷有沒(méi)有第二個(gè)參數(shù) if(!prev){ // 沒(méi)有prev復(fù)雜點(diǎn),第一次拿的是兩個(gè)元素a...
...untedCompleter { final E[] array; final MyMapper mapper; final MyReducer reducer; final int lo, hi; MapRed sibling;//兄弟節(jié)點(diǎn)的引用 E result; MapRed(CountedCompleter p, E[] ar...
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