A wrapper around the base js Object to make iterating and other basic functions easier

examples.js

let test = usefulHash({test: [1,2,3], dude: 'hi'})

test.forEach(function(k, v) { console.log(`${k}, ${v}`) })

test['zombies'] = true

test.forEach(function(k, v) { console.log(`2: ${k}, ${v}`) })

console.log(test.keys())
console.log(test.values())

test2 = test.merge({josh: 'cool'})

console.log(test2.keys())

useful_hash.js

function usefulHash(initialHash) {
  let base = {}
  let baseKeys = Object.keys(base)
  
  let methods = {}
  
  var hsh = Object.assign(initialHash, methods)
  
  function userKey(k) {
  	return !baseKeys.includes(k) && !Object.keys(methods).includes(k)
  }
  
  methods.forEach = function(cb) {
    return this.keys().forEach((k) => {
      return cb(k, this[k])
    })
  }
  
  methods.map = function(cb) {
    return this.keys().map((k) => {
    	return cb(k, this[k])
    })
  }
  
  methods.keys = function() {
  	return Object.keys(this).filter(userKey)
  }
  
  methods.values = function() {
  	return this.map((k) => { return this[k] })
  }
  
  methods.merge = function(otherHsh) {
  	return hsh = Object.assign(this, otherHsh)
  }
  
  hsh = Object.assign(initialHash, methods)
  
  return hsh
}