How i can do this with the 'for' of javascript

Question

I want to optimize my javascript code with a FOR by i can't do this and i don't know why.

My code :

let pokemon1 = 'premier';
let pokemon2 = 'second';
let pokemon3 = 'troisieme';
for (var i = 1; i < 4; i++) {
     console.log(pokemon[i]);
}

Do you know why it doesn't work ? Thank you very much and sorry if i am a noob.

The `[ ]` is for **arrays**. Declare `pokemon` as an array and your code will work. — Pointy, Oct 24 '17 at 23:41
Variable variables are almost always the wrong approach. Learn about data structures instead: http://eloquentjavascript.net/04_data.html . — Felix Kling, Oct 24 '17 at 23:45
@FelixKling This is clearly not a duplicate, OP as a beginner in code doesn't know about arrays and was clearly wondering if something existed to handle that kind of data. — Loïc, Oct 25 '17 at 03:00

Loïc · Answer 1 · 2017-10-24T23:53:16.447

Since you are using a list, you should use [] to define an array :

let pokemons = ['premier', 'second', 'troisième'];
for (let i = 0; i < pokemons.length; i++) {
     console.log(pokemons[i]);
}

See https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Array for more information.

Also you should note that the first element of a list is 0.

So basically pokemons[0] === 'premier and pokemons[2] === 'troisième'

score 1 · Answer 2 · answered Oct 24 '17 at 23:46

You should place the pokemon in an array:

let pokemon = [];
pokemon[0] = "premier";
pokemon[1] = "second";
pokemon[2] = "troisieme";
for(var i = 0; i < pokemon.length; i++){
 console.log(pokemon[i])
};

Followed by some reading time: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration

How i can do this with the 'for' of javascript

2 Answers2