CoffeeScript repeats the string

Repeat the string

Problem

You want to repeat a string.

Solution

Create an array of empty elements, and then stitch the array elements together with the string to be repeated as a connection character:

# 创建包含10个foo的字符串
Array(11).join 'foo'

# => "foofoofoofoofoofoofoofoofoofoo"

Repeat the method for the string

You can also create methods for strings in prototypes. It's simple:

# 为所有的字符串添加重复方法，这会重复返回 n 次字符串
String::repeat = (n) -> Array(n+1).join(this)

Discuss

JavaScript lacks string repeat functions, and CoffeeScript does not provide it. Although list inference (comprehensions) can also be used here, it is easier to build an array of n-1 empty elements like this for simple string repetition, and then stitch it together.