递归连接数组JavaScript中的字符串 [英] Recursively Concatenate Strings in Array JavaScript
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问题描述
我在Javascript中有一个String类型的数组. 例如:["ab","cd","ef","gh"] 此数组不是固定的&按字母顺序排列.
I have an array of type String in Javascript. Eg: ["ab", "cd", "ef", "gh"] This array is not fixed & is alphabetically ordered.
我想要这样的输出:
ab
abcd
abef
abgh
abcdef
abcdgh
abefgh
abcdefgh
cd
cdef
cdgh
cdefgh
ef
efgh
推荐答案
使用它来创建电源设置的x
:
function power(x) {
var r = [""], // start with empty set/string
l = 1;
for (var i=0; i<x.length; l=1<<++i) // OK, l is just r[i].length, but this looks nicer :)
for (var j=0; j<l; j++) {
r.push(r[j].slice(0)); // copy
r[j] += x[i];
}
return r;
}
用法:
> power(["ab", "cd", "ef", "gh"])
["abcdefgh", "cdefgh", "abefgh", "efgh", "abcdgh", "cdgh", "abgh", "gh", "abcdef", "cdef", "abef", "ef", "abcd", "cd", "ab", ""]
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