Function type

lib/internal/webidl.js:140–165

* Returns the ECMAScript specification type of a JavaScript value. * @see https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values * @param {any} V JavaScript value. * @returns {'Undefined'|'Null'|'Boolean'|'String'|'Symbol'|'Number'|'BigInt'|'Object'}

(V)

 * @returns {'Undefined'|'Null'|'Boolean'|'String'|'Symbol'|'Number'|'BigInt'|'Object'}
 */
function type(V) {
  // ECMA-262 6.1: map JavaScript values to language type names.
  switch (typeof V) {
    case 'undefined':
      return 'Undefined';
    case 'boolean':
      return 'Boolean';
    case 'string':
      return 'String';
    case 'symbol':
      return 'Symbol';
    case 'number':
      return 'Number';
    case 'bigint':
      return 'BigInt';
    case 'object':
    case 'function':
    default:
      // ECMA-262 6.1.2: null is its own language type.
      // ECMA-262 6.1.7: functions are Object values.
      if (V === null) {
        return 'Null';
      }
      return 'Object';
  }
}

/**
 * Returns IntegerPart(n).