closure_examples_with_curry.js

/* 
a closure gives you access to an outer function's scope from an inner function.
*/

const adder = (initialNum) => {
  return(nextNum) => {
    return initialNum + nextNum
  }
}

const add2 = adder(2)
console.log(add2(2))

const add4 = adder(4)
console.log(add4(4))

const funcWithPrivateVars = () => {
  //declared in closure scope
  const superSecret = 'SECRET'
  
  return{
    getSecret: () => {
      return superSecret
    }
  }
}

const privateObj = funcWithPrivateVars()
console.log(privateObj.getSecret())
//console.log(superSecret) -> will return undefined


const stephCurry = (num1) => {
  //num1
  return (num2) => {
    //num 2
    return (num3) => {
      //num 3
      return num1 + num2 + num3
    }
  }
}


console.log(stephCurry(1)(2)(3))