CODEWITHSUNDEEP
javascriptarrays
Thorin
Thorin

Reputation: 69

Javascript why can't i use an array like this and how can i access the array with a calculated number

var nodesXY = ['15% 15%','30% 16%','19% 42%','39% 80%',];
var number  = ["0","1","2","3","4","0","0","0"];

//some loop
    AccesNodes(number[1]);

function AccesNodes(number){
        console.log(number);
        //number = number;
        var firstNode = nodesXY[number];
        console.log(nodesXY[number]);
        console.log(firstNode);
        number++;
        var secondNode = nodesXY[number];
        console.log(nodesXY[number]);
        console.log(secondNode);
        number = number + 4;
        var secondNode = nodesXY[number];
        console.log(nodesXY[number]);
        console.log(secondNode);
    }

I don't get an undefined when I log the firstNode however when I calculate the number into "the next node" and try to get var secondNode = nodesXY[number+1]; I get an undefined. Why won't this work? Is there any other way to get this? I've searched all over.

Upvotes: 1

Views: 58

Answers (3)

Dentych
Dentych

Reputation: 106

Your array number contains elements of type string. Even though JavaScript is not type-strong, variables and elements still contain data of some specific type.

When you access number[X], it will therefore return a string. In order to make it work, you'll have to create an array of numbers: var number = [1,2,3,...] or parse the string returned from the array into a number using parseInt(number[X]).

For a list of the different types a JavaScript var can hold, see this page in the MDN JavaScript documentation.

Upvotes: 1

bnord
bnord

Reputation: 395

Your numbers array contains strings not actual numbers "1" + 1 will yield "11" instead of 2 which isn't a key in your array. Either use number = [0,1,...] or use parseInt(number) + 1.

Upvotes: 1

Aliz
Aliz

Reputation: 756

Use numbers in your number array, not strings 

var number  = [0,1,2,3,4,0,0,0];

Upvotes: 1

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