Progress bar generator function

progress_bar.js

/**
 * 
 * @param {number} percents / 100
 * @param {number} length 
 * @param {object} phases 
 * @param {string} phases.filled 
 * @param {string} phases.empty 
 * @param {string} phases.partial 
 */
function progress_bar(percents, length = 10, phases = { filled: '█', empty: '░', partial: '▓' }) {
  let bar = phases.empty.repeat(Math.floor(length));

  const completed = Math.floor(percents) / 100 * length;
  let i = 0;

  for (; i + 1 <= completed; i++) {
    bar = bar.slice(0, i) + phases.filled + bar.slice(i + 1);
  }

  if (phases.partial && (completed - Math.floor(completed)) >= 0.5 && completed < length) {
    bar = bar.slice(0, i) + phases.partial + bar.slice(i + 1);
  }

  return bar;
}