如何在没有 splice 方法的情况下向数组添加值并覆盖元素？ javascript

Question

Is there a way to concat an array at a specific index without overwriting the element, not using the splice method? I usually see concats happen in the beginning or end of an array.

Below is an example of using splice to concat an array at an index

var colors=["red","blue"];
var index=1;

//if i wanted to insert "white" at index 1
colors.splice(index, 0, "white");   //colors =  ["red", "white", "blue"]
```

Answer 1

You could take Array#copyWithin with some adjustments.

 const colors = ["red", "blue"], index = 1, value = "white"; colors.length++; // create space for moving colors.copyWithin(index + 1, index); // move values to right colors[index] = value; // add new value console.log(colors); // ["red", "white", "blue"]