This Gist implements functions from lodash

LodashFunctions.js

function multiply (a, b) {
  return a * b
}
/* 
  Creates a function that is restricted to invoking func once. 
  Repeat calls to the function return the value of the first invocation. 
  The func is invoked with the this binding and arguments of the created function.
*/
function once (fn) {
  var cacheValue = null
  var isCalled = false
  return function (...args) {
    if (!isCalled) {
      isCalled = true
      cacheValue = fn(...args) 
    }
    return cacheValue
  }
}

var newfn = once(multiply)

console.log(newfn(2,3)) // 5 
console.log(newfn(4,5)) // 5
console.log(newfn(4,5)) // 5
console.log(newfn(4,5)) // 5


var newfn1 = once(multiply)

console.log(newfn1(7, 10)) // 17
console.log(newfn1(9, 10)) // 17
console.log(newfn1(7, 10)) // 17
console.log(newfn1(9, 10)) // 17


var newfn2 = once(multiply)

console.log(newfn2(17, 10)) // 17
console.log(newfn2(8, 10)) // 17
console.log(newfn2(7, 10)) // 17
console.log(newfn2(9, 10)) // 17

/**
  Invokes func after wait milliseconds. Any additional arguments are provided to func when it's invoked
**/

function delay (fn , time, ...args) {
  var id = setTimeout(() => {
    fn(...args)
  }, time)
  
  return id

}

function logging (a1, a2, a3) {
  console.log(a1, a2, a3)
}

var id1 = delay(logging, 2000, 1,2,3)
var id2 = delay(logging, 3000, 1,2,3)
var id3 = delay(logging, 5000, 1,2,3)

clearTimeout(id1)


/* bind function basic implementation */

function logging (heading1, heading2, heading3, heading4) {
  return `${heading1} ${heading2} ${heading3} ${heading4} ${this.name}`
}



var obj1 = {
  name: 'obj1'
  
}

var obj2 = {
  name: 'obj2',
  logging: logging
}


function bind (fn, thisArg, ...args1) { 
  return function (...args2) {
    var value = null
    if (args1.length + args2.length > fn.length) {
      console.log('Extra Argument(s) provided to bind function will be ignored')
    } 
    return fn.apply(thisArg, [...args1, ...args2])
  } 
}


var bindfn = bind(obj2.logging, obj2, 'hi1', 'hi2')

console.log(bindfn('hi3', 'hi4'))