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mcamilleri10 / Blackbird

http://blackbird-aa.herokuapp.com/
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READ ME

Intro

Blackbird is a stock trading web app that allows for paper trading of any common stocks listed in the NYSE or NASDAQ. Users are able to signup for an account, add funds, create watchlists, and search for & trade as many stocks as they would like. Blackbird does not use real currency and does not ask for any bank information - funds can be added by simply entering entering an amount.

http://blackbird-aa.herokuapp.com/

Technologies Used In Building Blackbird

APIs and Third Party Resources

Features

Dynamic Live Search

Blackbird features a dynamic search bar that updates results as the user types - with color coded search matches.

search

Dynamic Graphs

Graphs are dynamically created based on a user selected date range. The color theme of the app, green or red, is based on whether the user's portfolio value is up or down for the day.

chart

One problem that needed to be solved was how to account for any null price values that were occasionally returned from the api. The code snippet below shows how the incoming data was formated for input into recharts.

formatIntraData() {
    const { quotes, user } = this.props;
    const dataObj = {};
    quotes.forEach(quote => {
      if (this.isShareOwned(quote)) {
        let i = 0;
        const num_owned = user.shares[quote.symbol].numSharesOwned;
        let nullPrice;
        quote.intradayPrices.forEach(price => {
          if (i % 5 === 0) {
            i++;
            if (price.average === null) {
              price.average = nullPrice;
            }
            nullPrice = price.average;   
            let sum = 0;
            sum += (price.average * num_owned);
            if (dataObj[price.label]) {
              dataObj[price.label]['price'] += sum;
            } else {
              dataObj[price.label] = {
                'date/time': price.label,
                'price': sum
              };
            }
          } else {
            i++;
            null;
          }
        });
      }
    });
    this.setState({ data: Object.values(dataObj) });
  }

Transaction Forms

Users are able to buy and sell shares using either shares or dollars as input. The transaction form dynamically adjusts if a user owns any shares in that company.

buy1 buy2 buy3

Future Implementation