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letとconstの違い

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const

定数値を持つ

→更新、再宣言ができない

const checekr= 2;
const checekr= 1;

→再宣言x

const checekr= 2;
checekr= 1;

→更新x

let

変数の宣言に使われる
let checker = 3;
checker = 2;

→更新可能

※基本的にCONST使用、必要によってLET、VARは使用X

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