CODEWITHSUNDEEP
jsonnode.jsloopsparsing
Matt Campbell
Matt Campbell

Reputation: 174

nodejs - How to Loop Through Keys in JSON String & Calc

I am trying to make a little nodejs ticker for calculating market cap. There are about 1500 entries. I want to loop through them, and sum up the values. Currently stuck on the loop

JSON URL

https://api.coinmarketcap.com/v1/ticker/?limit=10

Current Code

const https = require("https");
const url =
  "https://api.coinmarketcap.com/v1/ticker/";

https.get(url, res => {
  res.setEncoding("utf8");
  let body = "";
  res.on("data", data => {
    body += data;
  });
  res.on("end", () => {
    body = JSON.parse(body);

    console.log(
      `Coin: ${body[0].id} -`,
      `Marketcap: ${body[0].market_cap_usd}`
    );

   //Loop through body results, sum up body[key].market_cap_usd
   //console.log(total_sum)
  });
});

Current Output

Coin: bitcoin - Marketcap: 149563018605

Any help would be greatly appreciated!

Upvotes: 0

Views: 35

Answers (1)

calbertts
calbertts

Reputation: 1513

reduce is your friend:

const https = require("https");
const url =
  "https://api.coinmarketcap.com/v1/ticker/";

https.get(url, res => {
  res.setEncoding("utf8");
  let body = "";
  res.on("data", data => {
    body += data;
  });
  res.on("end", () => {
    body = JSON.parse(body);

    console.log(
      `Coin: ${body[0].id} -`,
      `Marketcap: ${body[0].market_cap_usd}`
    );

    const total_sum = body.reduce((sum, item) => sum + Number(item.market_cap_usd), 0)
    console.log(total_sum)
  });
});

Upvotes: 1

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