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17 lines
596 B
TypeScript
17 lines
596 B
TypeScript
const zeroPaddedString = (
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num: number,
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requiredDigits: number,
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position: "before" | "after"
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): string => {
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if (num < 0) throw new RangeError("negative number");
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if (requiredDigits < 0) throw new RangeError("invalid number of zeroes");
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if (position !== "before" && position !== "after")
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throw new TypeError("invalid position (before or after only)");
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const requiredZeroes = requiredDigits - (num + "").replace(".", "").length;
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const zeroes = "0".repeat(requiredZeroes);
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return position === "before" ? "" + zeroes + num : "" + num + zeroes;
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};
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export { zeroPaddedString };
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