如何清空字符串数组中的字符串，但保持数组的长度

Question

I have an array of strings in javaScript:

array = ['xx', 'xxxxxxxx', 'xxx'];

I want to reach this:

 array = ['', '', '']; //empty the strings but keep the length of array

What is the best way?

Answer 1

Use Array.fill .

 array = ['xx', 'xxxxxxxx', 'xxx']; array.fill(''); console.log(array)

If you need to create a new array, use the Array constructor combined with Array.fill :

 array = ['xx', 'xxxxxxxx', 'xxx']; const newArray = new Array(array.length); newArray.fill(''); console.log(newArray)

Answer 2

use.map method to remove content and return the empty string.

 array = ['xx', 'xxxxxxxx', 'xxx']; const newArray = array.map(data=> ("")); console.log(newArray)

Answer 3

array = array.map(function(item){return '';});

Answer 4

Use .map() method for immutability of original array.

 let array = ['xx', 'xxxxxxxx', 'xxx']; const emptyArr = array.map((item)=>""); console.log(emptyArr);