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                > 咕笛老師:此題看著簡單,但要想面試官給你高分還是有難度的。至少也要寫出幾種方法 js ~~~text var arr=['12','32','89','12','12','78','12','32']; // 最簡單數組去重法 function unique1(array){ var n = []; //一個新的臨時數組 for(var i = 0; i < array.length; i++){ //遍歷當前數組 if (n.indexOf(array[i]) == -1) n.push(array[i]); } return n; } arr=unique1(arr); // 速度最快, 占空間最多(空間換時間) function unique2(array){ var n = {}, r = [], type; for (var i = 0; i < array.length; i++) { type = typeof array[i]; if (!n[array[i]]) { n[array[i]] = [type]; r.push(array[i]); } else if (n[array[i]].indexOf(type) < 0) { n[array[i]].push(type); r.push(array[i]); } } return r; } //數組下標判斷法 function unique3(array){ var n = [array[0]]; //結果數組 for(var i = 1; i < array.length; i++) { //從第二項開始遍歷 if (array.indexOf(array[i]) == i) n.push(array[i]); } return n; } ~~~ es6 ~~~text es6方法數組去重 arr = [...new Set(arr)]; es6方法數組去重,第二種方法 arr = Array.from(new Set(arr)); //Array.from()能把set結構轉換為數組 ~~~
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