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我们来解一个问题

  1. 写一个函数, 可以连接字符数组, 如 f(['1','2']) => '12'

好吧,如果不用柯里化, 怎么写? 啊哈 reduce

var concatArray = function(chars){ return chars.reduce(function(a, b){ return a.concat(b); }); } concat(['1','2','3']) // => '123' 很简单,对吧.

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