Turn an array of numbers into a string of all those numbers

Question

I'm currently practicing the .reduce method in JavaScript and I have to turn an array of numbers into a string of all those numbers using the method mentioned before.

function stringConcat(arr) {
  return arr.reduce((acc, el) => acc.toString(el));
}

console.log(stringConcat([1, 2, 3])); // expected result is "123"

Answer 1

Try this:

The idea is to concat acc with el in every iteration, here is an example for [1,2,3]:

iteration 1: acc = '', el = 1 return '1'
iteration 2: acc = '1', el = 2 return '12'
iteration 3: acc = '12', el = 3 return '123'

function stringConcat(arr) {

  return arr.reduce((acc, el) => `${acc}${el}`);

}
console.log(stringConcat([1,2,3])); // the expected result is "123"

Learn more about reduce()

Cheers!