README.md

Bin2Dec

Binary to decimal converter

The live converter you can find by pressing the following link bin2dec.now.sh.

It's created using the React Create App (CRA) boilerplate.

The idea to make bin2dec converter came from the Florin Pop app ideas repository.

The inverted version of the converter (dec2bin) you can find there dec2bin.now.sh.

The main App component

import React, { useEffect, useState } from "react";
import "./App.css";

function App() {
  const [binaryIsValid, setBinaryIsValid] = useState(true);
  const [binaryValue, setBinaryValue] = useState("");
  const [decimalValue, setDecimalValue] = useState("");

  const formatValue = value => {
    return value
      .replace(/(\d{4})/g, "$1 ")
      .replace(/\s+/g, " ")
      .replace(/^\s+|\s+$/g, "");
  };

  const handleBinaryValueChange = e => {
    let value = String(e.target.value);
    if (!value) {
      setBinaryValue("");
      setBinaryIsValid(true);
    } else {
      setBinaryIsValid(/^([01\s]+)$/.test(value));
      setBinaryValue(formatValue(value));
    }
  };

  const calculateDecimal = binaryString => {
    let decimalResult = 0;
    for (
      let i = 0, j = binaryString.length - 1;
      i < binaryString.length;
      i++, j--
    ) {
      const digit = parseInt(binaryString[i]);
      decimalResult += digit * Math.pow(2, j);
    }
    return decimalResult;
  };

  useEffect(() => {
    if (binaryIsValid && binaryValue) {
      const decimalValue = calculateDecimal(binaryValue.replace(/\s+/g, ""));
      setDecimalValue(decimalValue);
    } else {
      setDecimalValue("");
    }
  }, [binaryValue, binaryIsValid]);

  return (
    <div id="bin2dec">
      <h1 id="header">Bin2Dec</h1>
      <input
        id="binary"
        className={binaryIsValid ? "" : "invalid"}
        type="text"
        placeholder="1010 1010"
        value={binaryValue}
        onChange={handleBinaryValueChange}
      />
      <div id="decimal">{decimalValue}</div>
    </div>
  );
}

export default App;

The main App styles

#bin2dec {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#header {
  font-size: 42px;
}

#binary {
  width: 100%;
  display: block;
  max-width: 350px;
  margin: 0 20px;
  font-size: 42px;
  text-align: center;
  background: transparent;
  color: white;
  border: 0;
  outline: 0;
  border-bottom: 1px solid white;
  margin-bottom: 30px;
}

#binary.invalid {
  color: #943838;
}

#decimal {
  font-size: 64px;
  height: 100px;
}

The global styles

body {
  margin: 0;
  font-family: "Karla", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
    monospace;
}

body,
html {
  margin: 0;
  padding: 0;
  background: #222222;
  color: white;
}