@technobuddha/library/dist/pad.js

A large library of useful functions

/**
 * Add leading zeros to a number to ensure a string of a minimum length
 * @param input - The number to pad
 * @param length - The minimum length of the resulting string
 * @returns number as a string with leading zeros as needed
 * @example
 * ```typescript
 * pad(5); // "05"
 * pad(42, 4); // "0042"
 * pad(-7, 3); // "-07"
 * pad(NaN, 4); // " NaN"
 * pad(Infinity, 6); // "Infinity"
 * ```
 * @group Math
 * @category Verbalization
 */
export function pad(input, length = 2) {
    if (Number.isNaN(input) || !Number.isFinite(input)) {
        return input.toString().padStart(length, ' ');
    }
    else if (input < 0) {
        return `-${Math.abs(input)
            .toString()
            .padStart(length - 1, '0')}`;
    }
    return input.toString().padStart(length, '0');
}
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