JavaScript Type Handling

type.js

class Type {

   static isBoolean(val) {
      return typeof(val) === 'boolean';
   }

   static isNull(val) {
      return val === null;
   }

   static isUndefined(val) {
      return typeof(val) === 'undefined';
   }
   
   static isNumber(val) {
      return typeof(val) === 'number';
   }

   static isString(val) {
      return typeof(val) === 'string';
   }
   
   static isSymbol(val) {
      return typeof(val) === 'symbol';
   }
   
   static isPrimitive(val) {
      return Type.isBoolean(val) ||
         Type.isNull(val) ||
         Type.isUndefined(val) ||
         Type.isNumber(val) ||
         Type.isString(val) ||
         Type.isSymbol(val);
   }
   
   static isObjectLiteral(val) {
      return typeof(val) === 'object' && val !== null;
   }
   
   static isArray(val) {
      return Array.isArray(val);
   }
   
   static isSet(val) {
      return val !== null && typeof(val) !== 'undefined';
   }
      
   static isEmptyString(val) {
      return val === '';
   }
   
}

module.exports = Type;