Function toNumber

lib/internal/webidl.js:263–285

* Returns ToNumber(V). * @see https://tc39.es/ecma262/#sec-tonumber * @param {any} V JavaScript value. * @param {ConversionOptions} [options] Conversion options. * @returns {number}

(V, options = kEmptyObject)

 * @returns {number}
 */
function toNumber(V, options = kEmptyObject) {
  if (typeof V === 'bigint') {
    // ECMA-262 ToNumber step 2: BigInt values throw.
    throw makeException(
      'is a BigInt and cannot be converted to a number.',
      options);
  }
  if (typeof V === 'symbol') {
    // ECMA-262 ToNumber step 2: Symbol values throw.
    throw makeException(
      'is a Symbol and cannot be converted to a number.',
      options);
  }

  // Unary plus performs ToNumber, including ToPrimitive(V, number) for
  // objects. Number(V) is not equivalent because it converts BigInt values,
  // including BigInt values produced by ToPrimitive.
  // Abrupt completions and native TypeErrors propagate unchanged. This is an
  // intentional diagnostics tradeoff: decorating object conversion failures
  // would require maintaining local ECMA-262 ToPrimitive and
  // OrdinaryToPrimitive implementations.
  return +V;
}

/**
 * Returns ToString(V).