是否可以像下面传统的 for 循环一样创建一个嵌套的 for...of 循环？

Question

我正在尝试使用 for...of 循环复制此选择排序 for 循环。我已经努力过渡了一段时间，但是，我尝试过的任何方法都没有奏效。这可能吗？

数组集：

var fruits = ["Apple", "Banana", "Carrot", "Guava", "Orange"];

传统for循环

for (var i = 0; i < fruits; i++) {
  let outerItem = fruits[i];
  for (var j = i + 1; j < fruits.length; j++) {
    let innerItem = fruits[j];
    if (innerItem == outerItem) {
      innerItem.length > outerItem.length ? fruits.splice(fruits.indexOf(outerItem), 1) :
        fruits.splice(fruits.indexOf(innerItem), 1);
    }
  }
}

for...of 循环

for(let  outerItem of fruits)
{
    for(let innerItem of fruits)
    {
        
    }
}

Answer 1

要快速复制数组，请使用切片：const sliced = fruits.slice();

下面显示了 Traditional for loop 和 for...of loop 在给定数组 var fruits = ["Apple", "Banana", "Carrot", "Guava", "Orange"];

上的解决方案

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const writeln = (text = '') => document.writeln(text + '<br/>');
    </script>
    <script>
        var fruits = ["Apple", "Banana", "Carrot", "Guava", "Orange"];

        writeln(fruits);

        writeln();
        writeln('Slice');
        const sliced = fruits.slice();
        writeln(sliced);    

        writeln();
        writeln('Traditional for loop');    
        const copy = [];
        for (var i = 0; i < fruits.length; i++) {
            copy.push(fruits[i]);
        }
        writeln(copy);

        writeln();
        writeln('for...of loop');
        const copy1 = [];
        for (const value of fruits) {
            copy1.push(value);
        }
        writeln(copy1);
    </script>
</body>
</html>

是否可以像下面传统的 for 循环一样创建一个嵌套的 for...of 循环？

Is it possible to create a nested for...of loop in the same way as the traditional for loop below?

javascript

arrays

sorting

data-structures