parjs/src/internal/functions/helpers.ts

A parser-combinator library for JavaScript.

/**
 * @external
 */ /** */

import repeat from "lodash/repeat";


/**
 * Some simple helpers for working with strings.
 */
export namespace StringHelpers {
    /**
     * Recursively applies join to an array of arrays.
     * @param arr
     */
    export function recJoin(arr: any): string {
        if (arr instanceof Array) {
            return arr.map(x => this.recJoin(x)).join("");
        } else {
            return String(arr);
        }
    }

}

/**
 * Helpers for working with numbers.
 */
export namespace NumHelpers {
    /**
     * Pads an integer with characters.
     * @param n
     * @param digits
     * @param char
     */
    export function padInt(n: number, digits: number, char: string) {
        let str = n.toString();
        if (str.length >= digits) return str;
        return repeat(char, digits - str.length) + str;
    }
}