How to return an array of numbers that represent lengths of elements string?

user_18070035 0
Viewed 45

If an array was: ['hey', 'you', 'muddy'] The expected output should be: [3, 3, 5]

This is what I have so far:

function lengths(arr) {
  numbersArray = [];
  for (var i = 0; i < arr.length; i++) {
    numbersArray = arr[i].length;
  }
}

Any help would be much appreciated.

function oop arrays loops javascript
4 Answers

You need to push the length of every item (using Array#push) and return the array in the end:

function lengths(arr) {
  const numbersArray = [];
  for (let i = 0; i < arr.length; i++) {
    numbersArray.push(arr[i].length);
  }
  return numbersArray;
}

console.log( lengths(['hey', 'you', 'muddy']) );

Another solution using Array#map:

function lengths(arr) {
 return arr.map(str => str.length);
}

console.log( lengths(['hey', 'you', 'muddy']) );

user_74863130 

const getStringLength = (arr) => {
  return arr.map((item) => item.length);
}
console.log(getStringLength(['hello', 'world']));

user_102733080 
function lengths(arr) {
  return arr.map(el => el.length)
}

Array.map is commonly used in such things. Docs

user_121907290

Try this.

const arrStrLen =(a)=>a.map((i)=>i.length);

console.log(arrStrLen(['hey', 'you', 'muddy']));

console.log(arrStrLen(['How','to','return']));

user_116067280
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