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//For each
const array = [1, 2, 10, 16];

const double = [];
const newArray = array.forEach(
  (num) => {
    double.push(num * 2);
  }
)

//For EACH ONLY WANNTS TO ITERATE AND APPLY WHATEVER WE WANT
//With for each u can do a lot of SIDE EFFECTS which is not that good



//map , filter, reduce = the most important methods ====================

//map is like a PURE FUNCTION WHICH IS GOOD
//same as above, but RETURN is a must, automatically returns new array
const mapArray = array.map((num) => {
  return num * 2
})

//Since we use only one parametr and one single like, we can write it like this:
const mapArray = array.map(num => num * 2);

//MAP WANTS TO ITERATE AND RETURN, MAP CREATES A NEW ARRAY

//Filter ==============================
//filter array with a condition
//we also RETURN an array
const filterArray = array.filter((num) => {
  return num > 5
})

//or like this

const filterArray = array.filter(num => num > 5);



//Reduce =====================================
//VERY POWERFUL!!!!

const reduceArray = array.reduce((accumulator, num) => {
  debugger;
  return accumulator + num
}, 5);

//Last 5 is an accumulator.
//a number that is stored through the process return is not an array