Javascript中的循环功能 [英] Cycle function in Javascript

问题描述

我是Javascript的新手，我正在寻找一个循环功能。这是 Clojure的实现我试图找到一个循环函数，通过值无限循环/递归数组。我希望在下划线库中找到类似的东西，但我找不到合适的东西。理想情况下我想使用这样的东西：

  _.head（_。cycle（[1,2,3]） ，100）
  

此函数将返回100个元素的数组：

  [1,2,3,1,2,3,1,2,3,1,2,3，...] 
  

我可以在Javascript中使用这样的函数吗？这是我的可行尝试，但我似乎无法让它工作：

  arr = [1,2,3， 4,5,6,7,8,9]; 
 
 var cycle = function（arr）{
 arr.forEach（function（d，i）{
 if（d === arr.length）
 return d 
d == 0 
 else {return d} 
}）; 
}; 
  

cycle（arr）;

你可以这样做：

  var cycle = function（array，count）{
 var output = []; 
 
 for（var i = 0; i< count; i ++）{
 output.push（array [i％array.length]）; 
} 
 
返回输出; 
} 
  

I new to Javascript and I am looking for a cycle function. Here's Clojure's implementation I am trying to find a cycle function that infinitely loops/recurses through values of an array. I was hoping to find something like this in the underscore library, but I could not find anything suitable. Ideally I would like to use something like this:

 _.head(_.cycle([1,2,3]), 100)

This function would return an array of 100 elements:

[1,2,3,1,2,3,1,2,3,1,2,3,...]

Is there a function like this I can use in Javascript? Here's my feable attempt, but I can't seem to get it to work:

arr = [1,2,3,4,5,6,7,8,9];

var cycle = function(arr) {
  arr.forEach(function(d, i) {
    if (d === arr.length)
      return d
      d == 0
    else {return d}
  });
};

cycle(arr);

解决方案

You could do something like:

var cycle = function(array, count) {
    var output = [];

    for (var i = 0; i < count; i++) {
        output.push(array[i % array.length]);
    }

    return output;
}

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