...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 将数组元素计算为一个值(从左到右) Array.prototype.myReduce = function(callback,initialValue){ var num = 0; if (...
... = item; temp++; } } return arr; } 五、myReduce //myReduce 将数组元素计算为一个值(从左到右) Array.prototype.myReduce = function(callback,initialValue){ var num = 0; if (...
...累加值的初始值就会是数组的第一个元素。 Array.prototype.myReduce = function(callback,init) { let acc,idx; if(init){ acc = init // 检测我们是不是传了init idx = 0 } else { acc = this[0] idx = 1 } for(le...
...nsole.log(myFilter);// [2, 4, 6, 8, 10, 12, 14] //reduct函数 var myReduce = numbers.reduce(function(previous,current,index){ return previous + + current; }); console.log(myRedu...
...并不复杂 // callback参数有4个。pre,cur,index,arr Array.prototype.myReduce = function(callback,prev){ for(let i = 0 ; i < this.length; i++){ // 判断有没有第二个参数 if(!prev){ // 没有prev复杂点,第一次拿的是两个元素a...
...untedCompleter { final E[] array; final MyMapper mapper; final MyReducer reducer; final int lo, hi; MapRed sibling;//兄弟节点的引用 E result; MapRed(CountedCompleter p, E[] ar...
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