CODEWITHSUNDEEP
javascriptecmascript-6
Rory
Rory

Reputation: 1492

ES6 array initialization

Very new to ES6. In ES5 I might do something like this

function newArray(){
   var data = [];
   for(var i = 0; i < 5; i++){
    data[i] = "test data " + i;   
   }
  return data;
}

x = newArray()

How would I do this in ES6 ? What I've got below is in error

 getData = () => ({
    let data = Array.from(new Array(5), (x, i) => "test data " + i)
    return {
        data
    }
})

Upvotes: 2

Views: 2995

Answers (2)

Mμ.
Mμ.

Reputation: 8542

In ES6 it should be something like this:

const data = Array.from(new Array(5), (x, i) => "test data " + i);
// if you want to return an object with the field data mapped to your array
const getData2 = () => ({ data });
console.log(getData2());

Upvotes: 1

Mihai Alexandru-Ionut
Mihai Alexandru-Ionut

Reputation: 48357

You create wrong the function with ES6

getData = () =>{
    let data = Array.from(new Array(5), (x, i) => "test data " + i)
    return {
        data
    };
}
console.log(getData())

You can fill an array using fill and map methods.

//arr.fill(value, start, end)
getData = () =>{
    let data = new Array(5).fill(0).map((a,i)=>"test data " + i);
    return {
        data
    };
}
console.log(getData())

Upvotes: 2

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