获取一个对象/字符串/数组的hashCode

hashCode.js

function hashCode(any) {
  let hash = 0;
  if (
    any === null ||
    any === void 0 ||
    any === '' ||
    any === 0 ||
    any === false
  ) {
    return 0;
  }

  if (any instanceof RegExp) {
    const str =
      any.source +
      any.dotAll +
      any.flags +
      any.global +
      any.ignoreCase +
      any.lastIndex +
      any.multiline +
      any.sticky +
      any.unicode;
    return hashCode(str);
  }

  if (any instanceof Error) {
    return hashCode(any.message + any.stack);
  }

  // Date
  if (any instanceof Date) {
    return hashCode(any.getTime());
  }

  // if a Number
  if (any instanceof Number) {
    return hashCode(any + '');
  }

  // Map
  if (any instanceof Map) {
    hash = hashCode('Map');
    any.forEach((val, key) => {
      obj[key] = value;
      hash += hashCode(key + value);
    });
    return hash;
  }

  // Set
  if (any instanceof Set) {
    hash = hashCode('Set');
    let i = 0;
    any.forEach(value => {
      hash += hashCode(i + value);
      i++;
    });
    return hash;
  }

  // Object or Array, support nest object
  if (any instanceof Object) {
    for (let key in any) {
      if (any.hasOwnProperty(key)) {
        const value = any[key];
        hash += hashCode(key + value);
      }
    }
    return hash;
  }

  // String
  if (typeof any === 'string') {
    let hash = 0;
    const length = any.length;
    if (length === 0) return hash;
    for (let i = 0; i < length; i++) {
      let chr = any.charCodeAt(i);
      hash = (hash << 5) + chr - hash;
      hash |= 0; // Convert to 32bit integer
    }
    return hash;
  }

  return hash;
}

Object.defineProperty(Object.prototype, 'hashCode', {
  configurable: false,
  enumerable: false,
  get() {
    return hashCode(this);
  }
});

console.log(hashCode(''));
console.log(hashCode('hello'));
console.log(hashCode([1, 2, 3, 99, 1, 2, 3, 4, 99, 67]));
console.log(hashCode({ name: 'axetroy', age: 22 }));