ES6 Set All In One

ES6 Set All In One

Set 集合

Map 字典/地图

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

Set

数组去重

const arr = [1, 2, 3, 3, 2, 1];

const unique = [...new Set(arr)];
// [1, 2, 3]

const arr = [1, 2, 3, 3, 2, 1];

// unique = arr.reduce((acc, item) => !acc.includes(item) ? acc.concat([item]) : acc, []);

const unique = arr.reduce((acc, item) => {
 if(!acc.includes(item)) {
   acc.push(item);
 }
 return acc;
}, []);

// [1, 2, 3]

refs

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