podeng/types/detector.js

Simple JSON value normalization to make everything gone right.

'use strict';

const ARRAY_V = '[object Array]';
const OBJECT_V = '[object Object]';
const STRING_V = '[object String]';
const FUNC_V = '[object Function]';
const NUMBER_V = '[object Number]';
const BOOL_V = '[object Boolean]';
const NULL_V = '[object Null]';
const DATE_V = '[object Date]';
const UNDEF_V = '[object Undefined]';
const ERROR_V = '[object Error]';
const SYMBOL_V = '[object Symbol]';

const comparator = comp => {
  return obj => Object.prototype.toString.call(obj) === comp;
};

const isArray = comparator(ARRAY_V);
const isObject = comparator(OBJECT_V);
const isFunction = comparator(FUNC_V);
const isString = comparator(STRING_V);
const isNumber = comparator(NUMBER_V);
const isBoolean = comparator(BOOL_V);
const isNull = comparator(NULL_V);
const isDate = comparator(DATE_V);
const isUndefined = comparator(UNDEF_V);
const isError = comparator(ERROR_V);
const isSymbol = comparator(SYMBOL_V);
const isInt = num => !isSymbol(num) && Number(num) === num && num % 1 === 0;
const isFloat = num => !isSymbol(num) && Number(num) === num && num % 1 !== 0;
const isStringFloat = num =>
  !isNull(num) &&
  !isFloat(num) &&
  !isNaN(num) &&
  num.toString().indexOf('.') !== -1;
const isJSONObject = obj => {
  const isObj = isObject(obj);
  if (!isObj) return false;

  if (typeof obj.constructor !== 'function') return true;

  // determine the constructor type
  const type = Object.prototype.toString.call(obj.constructor());

  return type === OBJECT_V;
};

module.exports = {
  isArray,
  isObject,
  isFunction,
  isString,
  isNumber,
  isBoolean,
  isNull,
  isDate,
  isUndefined,
  isError,
  isSymbol,
  isInt,
  isFloat,
  isStringFloat,
  isJSONObject
};