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letのblock scop
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| for (var i = 0; i < 5; i++) { | |
| setTimeout(function () { | |
| console.log(i); | |
| }, i * 1000); | |
| } | |
| // 5, 5, 5, 5, 5 |
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| for (let i = 0; i < 5; i++) { | |
| setTimeout(function () { | |
| console.log(i); | |
| }, i * 1000); | |
| } | |
| // 0, 1, 2, 3, 4 |
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ループカウンタに
letを使うと、iteration毎にiが宣言され、直前のiteration後の値で初期化される。forブロック内でループカウンタをrebind、closureに引数でループカウンタを渡すことは不要。