number-as-string
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Precise number scaling and formatting without JavaScript floating-point precision issues
32 lines • 1.3 kB
JavaScript
import { trimWithPrecision } from "./trim-with-precision";
/**
* Converts a number or string to a scaled number string with the specified number of decimal places.
*
* @param value - The number or string to convert.
* @param decimals - The number of decimal places to include in the scaled number string.
* @returns The scaled number string.
*
* @example
* scaleUp("0.000000001", 18) // "1000000000"
* // 0.000000001 * 10 ** 18 = 1000000000.0000001
* scaleUp(1.23456789, 2) // "123"
* scaleUp(1, 18) // "1" + "0".repeat(18)
* scaleUp(0.000000001, 18) // "1"
*/
export function scaleUp(value, decimals) {
const trimmedValue = trimWithPrecision(value, decimals);
const [intPart, fracPart = ""] = trimmedValue.split(".");
const sign = intPart.startsWith("-") ? "-" : "";
const cleanedIntPart = sign
? intPart.slice(1).replace(/^0+/, "") || "0"
: intPart.replace(/^0+/, "") || "0";
if (decimals === 0) {
return `${sign}${cleanedIntPart}`;
}
const combinedDigits = `${cleanedIntPart}${fracPart
.padEnd(decimals, "0")
.slice(0, decimals)}`;
const trimmedCombinedDigits = combinedDigits.replace(/^0+/, "") || "0"; // Remove leading zeros
return `${sign}${trimmedCombinedDigits}`;
}
//# sourceMappingURL=scale-up.js.map