Handlebars compare helper

Handlebars.registerHelper('compare', function (a, operator, b, options) {
  let result;

  switch (operator) {
    case '==':
      result = a == b;
      break;
    case '===':
      result = a === b;
      break;
    case '!=':
      result = a != b;
      break;
    case '!==':
      result = a !== b;
      break;
    case '>':
      result = a > b;
      break;
    case '<':
      result = a < b;
      break;
    case '>=':
      result = a >= b;
      break;
    case '<=':
      result = a <= b;
      break;
    default:
      throw new Error('Unknown operator ' + operator);
  }

  if (result) {
    return options.fn(this);    // block runs if true
  } else {
    return options.inverse(this); // block runs if false
  }
});