Is there a shorter way to join an array to one string besides Array.prototype.join()?

Question

I want to join an array to one string. Normally I would write:

x=a=>a.join('')

x([1,2,3,4,5]);         // '12345'
x(['a','b','c','d']);   // 'abcd'
x(['1','2']);           // '12'
x([undefined,null]);    // ''

Is there any way to write this function using even less characters?

Answer 1

借助ES6的模板文字，您可以这样编写：

x=a=>a.join``

Answer 2

如果您愿意使用default ,分隔符：

x=a=>a+''