CODEWITHSUNDEEP
javascriptjsonfetchnumber-formatting
bambadamm
bambadamm

Reputation: 79

get the value of the last array with unknown number id

I'd like to calculate a price change for different time periods with the following code:

     var lastId = data.prices.length;
     var numberOf = Number(lastId);     
     document.getElementById('ideir').innerHTML = data.prices[numberOf][1] - data.prices[0][1];

data.prices.length on its own gives something like 274 - a number. When I try to use it as a number iD for a json fetched data it stops working. I tried to convert it to a number just in case, but first of all it already is a number, and secondly it's also not working as a number iD. The data.prices[0][1] on its own gives the correct json value - the first price from the fetched time period.

What should I do to get the value of the last available from the fetched JSON data?

Upvotes: 0

Views: 63

Answers (1)

Wisam Shaker
Wisam Shaker

Reputation: 199

Array in javascript start from 0 so the last element would have the index of length - 1. The third line should look like this:

document.getElementById('ideir').innerHTML = data.prices[numberOf-1][1] - data.prices[0][1];

Upvotes: 1

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