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字符串数组去重 ["a","b","c","a","b","c"] --> ["a","b","c"]


非正则实现: 


let str_arr=["a","b","c","a","b","c"]

function unique(arr){
return [...new Set(arr)]
}

console.log(unique(str_arr)) // ["a","b","c"]


用正则实现:


var str_arr = ["a", "b", "c", "a", "b", "c"]

function unique(arr) {
return arr.sort().join(",,").
replace(/(,|^)([^,]+)(,,\2)+(,|$)/g, "$1$2$4").
replace(/,,+/g, ",").
replace(/,$/, "").
split(",")
}

console.log(unique(str_arr)) // ["a","b","c"]



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