iwt/index.js

iwt is a javascript utility that returns the value passed in when the passed variable is the value of the type you want, otherwise it returns the value of the default type.

const TYPEOF = {
  BOOLEAN: "boolean",
  NUMBER: "number",
  STRING: "string",
  FUNCTION: "function",
  ARRAY: "array",
  DATE: "date",
  REGEXP: "regExp",
  UNDEFINED: "undefined",
  NULL: "null",
  OBJECT: "object",
  SYMBOL: "symbol"
};

/**
 * @param {any}
 * @return {string}
 */
const typeOf = function typeOf(obj) {
  const { toString } = Object.prototype;
  const map = {
    "[object Boolean]": TYPEOF.BOOLEAN,
    "[object Number]": TYPEOF.NUMBER,
    "[object String]": TYPEOF.STRING,
    "[object Function]": TYPEOF.FUNCTION,
    "[object Array]": TYPEOF.ARRAY,
    "[object Date]": TYPEOF.DATE,
    "[object RegExp]": TYPEOF.REGEXP,
    "[object Undefined]": TYPEOF.UNDEFINED,
    "[object Null]": TYPEOF.NULL,
    "[object Object]": TYPEOF.OBJECT,
    "[object Symbol]": TYPEOF.SYMBOL
  };
  return map[toString.call(obj)];
};

/**
 *
 * @param {string} type
 * @param {object} obj
 * @param {string} path
 * @param {any} defaultValue
 */
const getValue = function getValue(type, value, defaultValue) {
  /**
   * 是否设置了默认属性
   */
  const map = {
    [TYPEOF.BOOLEAN]: true,
    [TYPEOF.NUMBER]: 0,
    [TYPEOF.STRING]: "",
    [TYPEOF.FUNCTION]: new Function(),
    [TYPEOF.ARRAY]: [],
    [TYPEOF.DATE]: new Date(),
    [TYPEOF.REGEXP]: new RegExp(),
    [TYPEOF.UNDEFINED]: undefined,
    [TYPEOF.NULL]: null,
    [TYPEOF.OBJECT]: {},
    [TYPEOF.SYMBOL]: Symbol(`${TYPEOF.SYMBOL}`)
  };

  const defaultVal = defaultValue !== undefined ? defaultValue : map[type];
  return type === typeOf(value) ? value : defaultVal;
};

const iwt = {};
Object.values(TYPEOF).forEach(type => {
  iwt[type] = (value, options) => getValue(type, value, options);
});

module.exports = {
  typeOf,
  getValue,
  boolean: iwt.boolean,
  number: iwt.number,
  string: iwt.string,
  function: iwt.function,
  array: iwt.array,
  date: iwt.date,
  regExp: iwt.regExp,
  undefined: iwt.undefined,
  null: iwt.null,
  object: iwt.object,
  symbol: iwt.symbol
};