How can I keep track of array index with for...of loop? [duplicate]

Question

This is the object:

const game = {
  team1: 'Bayern Munich',
  team2: 'Borrussia Dortmund',
  players: [
    [
      'Neuer',
      'Pavard',
    ],
    [
      'Burki',
      'Schulz',
    ],
  ],
  score: '4:0',
  scored: ['Lewandowski', 'Gnarby', 'Lewandowski', 'Hummels'],
  date: 'Nov 9th, 2037',
  odds: {
    team1: 1.33,
    x: 3.25,
    team2: 6.5,
  },
};

I want use for..of and keep track of array index while looping.

Possible solution:

for (const [i, player] of game.scored.entries())
  console.log(`Goal ${i + 1}: ${player}`);

Or:

let i = 0
for(const game1 of game.scored) {
  i++;
  console.log(i,game1)
}

But is it possible to declare any variable in for statement and keep track of it?

Thank you.

why nor take standard for?

Nina Scholz
– Nina Scholz

2021-06-09 08:50:21 +00:00
Commented Jun 9, 2021 at 8:50 — Nina Scholz
– Nina Scholz, Commented Jun 9, 2021 at 8:50
Or this? stackoverflow.com/questions/34348937/…

Nico Haase
– Nico Haase

2021-06-09 08:53:16 +00:00
Commented Jun 9, 2021 at 8:53 — Nico Haase
– Nico Haase, Commented Jun 9, 2021 at 8:53

Nino Filiu · Accepted Answer · 2021-06-09 08:54:12Z

4

You can't. But you have these four alternatives:

const arr = ['apple', 'banana', 'carrot']

for (const i in arr) { console.log(i, arr[i]) }
for (let i = 0; i < arr.length; i++) { console.log(i, arr[i]) }
for (const [i, elt] of arr.entries()) { console.log(i, elt) }
arr.forEach((elt, i) => console.log(i, elt))

answered Jun 9, 2021 at 8:54

Nino Filiu

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