CODEWITHSUNDEEP
javascriptarraysstring
Artem Metelskyi
Artem Metelskyi

Reputation: 3

Transform an array into a string with adding numbers of each element of an array?

var array = ['a', 'b', 'c']
function arrayTransform(array) {
  if (array.lengths === 0) {
    console.log("Empty")
  } else {
    console.log(array.join());
  }
}

arrayTransform(array);

the outcome should be 1.a, 2.b, 3.c I am getting abc

Upvotes: 0

Views: 70

Answers (4)

Sumer
Sumer

Reputation: 2867

Welcome to Stackoverflow. Would you mind using the ES6 solution as shared below. Let me know if you need it in ES5.

let result = array.map((val, i) => i + 1 + "." + val);
console.log(result);

Upvotes: 0

Mohammad Usman
Mohammad Usman

Reputation: 39322

You can use .reduce() to get the resultant string:

let data = ['a', 'b', 'c'];

let reducer = arr => arr.length ?
                     arr.reduce((r, c, i) => (r.push(`${i + 1}.${c}`), r), []).join() :
                     'Empty';

console.log(reducer(data));
console.log(reducer([]));

Upvotes: 0

brk
brk

Reputation: 50291

Seems you wnat to add the index with the element. In that case use map function which will return an array and then use join to create the final string 

var array = ['a', 'b', 'c']

function arrayTransform(array) {
  if (array.lengths === 0) {
    console.log("Empty")
  } else {
    return array.map((item, index) => {
      return `${index+1}.${item}` // template literals

    }).join()
  }
}

console.log(arrayTransform(array));

Upvotes: 1

Nina Scholz
Nina Scholz

Reputation: 386560

You could map the incremented index with the value and join it to the wanted style.

var array = ['a', 'b', 'c']
function arrayTransform(array) {
  if (array.lengths === 0) {
    console.log("Empty")
  } else {
    console.log(array.map((v, i) => [i + 1, v].join('.')).join());
  }
}

arrayTransform(array);

Upvotes: 1

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