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開始行:
* 配列からユニークな値を取り出す [#a170cd98]
** Set()を使う方法 [#m85ab09d]
const objects = [
{id: 1, num: 1},
{id: 2, num: 2},
{id: 3, num: 3},
{id: 4, num: 2},
{id: 5, num: 1},
];
const unique_nums = [...new Set(objects.map(({ num }) =>...
=> [ 1, 2, 3 ]
** 参考 [#a18e4c3c]
https://stackoverflow.com/questions/1960473/get-all-uniqu...
終了行:
* 配列からユニークな値を取り出す [#a170cd98]
** Set()を使う方法 [#m85ab09d]
const objects = [
{id: 1, num: 1},
{id: 2, num: 2},
{id: 3, num: 3},
{id: 4, num: 2},
{id: 5, num: 1},
];
const unique_nums = [...new Set(objects.map(({ num }) =>...
=> [ 1, 2, 3 ]
** 参考 [#a18e4c3c]
https://stackoverflow.com/questions/1960473/get-all-uniqu...
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