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[JavaScript]数字をカンマ区切りにすることができる地味に便利な機能

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toLocaleString()

toLocalString()は数字をカンマ区切りにし、文字列に変換します。

toLocaleString.js
let a = 10000;
console.log(a.toLocaleString());
//'10,000'とカンマ区切りで表示される

let b = 1000.12;
console.log(b.toLocaleString());
//'1,000.12'と表示
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