JS常用小功能

個人部落格：

常用小功能/

陣列去重

字串反轉

陣列去扁平化並去重排序

判斷陣列的方法

陣列並集、交集、差集

var arr1 =[1

,2,3
,4];
var arr2 =[2
,4,6
,8];
// 使用includes
var union = arr1.
concat
(arr2.
filter
(v =>
!arr1.
includes
(v)));
// 並集
console.
log(union)
;var intersection = arr1.
filter
(v=> arr2.
includes
(v))
;// 交集
console.
log(intersection)
;var difference = arr1.
concat
(arr2)
.filter
(v =>
!arr1.
includes
(v)||
!arr2.
includes
(v))
;// 差集
console.
log(difference)
;// 使用set
var seta =
newset
(arr1)
;var setb =
newset
(arr2)
;var union1 = array.
from
(new
set(arr1.
concat
(arr2)))
;var union2 = array.
from
(new
set(
[...arr1,
...arr2]))
;console.
log(union1)
;// [1, 2, 3, 4, 6, 8]
console.
log(union2)
;// [1, 2, 3, 4, 6, 8]
var intersection1 = arr1.
filter
(v=> setb.
has(v));
console.
log(intersection1)
;var difference1 = arr1.
concat
(arr2)
.filter
(v =>
!seta.
has(v)
||!setb.
has(v));
console.
log(difference1)
;

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