ramda-adjunct/es/internal/polyfills/String.padStart.js

Ramda Adjunct is the most popular and most comprehensive set of utilities for use with Ramda, providing a variety of useful, well tested functions with excellent documentation.

import isFunction from '../../isFunction';
import isNotUndefined from '../../isNotUndefined';
import repeat from './String.repeat';

var padStartPolyfill = function padStartPolyfill(padString, targetLength, value) {
  // eslint-disable-next-line no-bitwise
  var finalLength = targetLength >> 0; // truncate if number, or convert non-number to 0;

  var finalPadString = String(isNotUndefined(padString) ? padString : ' '); // return the original string, if targeted length is less than original strings length

  if (value.length >= finalLength) {
    return String(value);
  }

  finalLength -= value.length;

  if (finalLength > finalPadString.length) {
    var lenghtToPad = finalLength / finalPadString.length; // append to original to ensure we are longer than needed

    finalPadString += isFunction(String.prototype.repeat) ? finalPadString.repeat(lenghtToPad) : repeat(finalPadString, lenghtToPad);
  }

  return finalPadString.slice(0, finalLength) + String(value);
};

export default padStartPolyfill;