【JavaScript】数値を0埋めされた文字列として加工する

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/**
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 * @description Get number padded by zero and formatted as String.
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 * @param {number} num
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 * @return {string}
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*/
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function zeroPadding(num, digit){
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  return (`"0000"${num}`).slice(-4);
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}

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/**
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 * @description Get number padded by zero and formatted as String.
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 * @param {number} num
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 * @param {number} digit
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 * @return {string}
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*/
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function zeroPadding(num, digit){
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  return (`${"0".repeat(digit)}${num}`).slice(-digit);
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}