How to print elements from array with recursion in javascript

Question

Array.prototype.myForEach = function(element) {
  for (var i = 0; i < this.length; i++) {
    element(this[i], i, this);
  }
};

var forArr = ['8', '17', '25', '42','67'];
forArr.myForEach(function(exm){
  console.log(exm);
});

I wrote in the form. Can you help in translating this into recursive?

recursive, you say, from the last value to the first, backwards? — Calvin Nunes
– Calvin Nunes, Commented Apr 9, 2018 at 14:09
No. It will be from the beginning to the end, but the function will call itself in order to call the first element of the array and the second element. I can give hope. — Selin Elibol
– Selin Elibol, Commented Apr 9, 2018 at 14:13
really unclear how recursion would work with a flat array. Usually you would use recursion for nested arrays. — epascarello
– epascarello, Commented Apr 9, 2018 at 14:14

Luis felipe De jesus Munoz · Accepted Answer · 2018-04-09 14:15:06Z

3

var forArr = ['8', '17', '25', '42','67'];

var recursive_function = function(array){
  if(array.length > 0){
    console.log(array[0]);
    recursive_function(array.slice(1))
  }
}

recursive_function(forArr)

answered Apr 9, 2018 at 14:15

Luis felipe De jesus Munoz

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Comments

PerrinPrograms · Accepted Answer · 2018-04-09 18:33:25Z

3

Array.shift will do the trick here

var forArr = ['8', '17', '25', '42', '67'];

function recursivearray(array) {
  if (array.length > 0) {
    console.log(array.shift());
    recursivearray(array);
  }
}
recursivearray(forArr);

edited Apr 9, 2018 at 18:33

answered Apr 9, 2018 at 14:14

PerrinPrograms

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Comments

Nina Scholz · Accepted Answer · 2018-04-09 14:40:14Z

1

You could use a function call with an additional parameter for the actual index.

Array.prototype.myForEach = function (fn, thisArg, i = 0) {
    if (!(i in this)) {
        return;
    }
    fn.bind(thisArg)(this[i], i, this);
    this.myForEach(fn, thisArg, i + 1);
};

function showValues(v, i, a) {
    console.log(v, i, JSON.stringify(a));
}

[99, 100, 101, 102].myForEach(showValues);

edited Apr 9, 2018 at 14:40

answered Apr 9, 2018 at 14:26

Nina Scholz

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1 Comment

Selin Elibol Over a year ago

Thank you. This is the answer I'm looking for

Darrow Hartman · Accepted Answer · 2022-07-31 22:55:30Z

0

This code should print elements with recursion in JS:

var foo = ["8", "17", "25", "42", "67"];
const product = (arr) => {
  if (!arr.length) return 1;
  return product(arr.slice(1)) * arr[0];
};
console.log(product(foo));

edited Jul 31, 2022 at 22:55

Darrow Hartman

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answered Jul 30, 2022 at 8:37

mohammad mohsin

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