30 seconds of React-Native

Curated collection of useful React snippets that you can understand in 30 seconds or less.

• Use Ctrl + F or command + F to search for a snippet.
• Contributions welcome, please read the contribution guide.
• Snippets are written in React 16.8.3, React-Native 0.59.9, using hooks.

NOTE: This repo has no affiliation with the original 30 Seconds of Code, was based on 30 Seconds of React but has no affiliation with it whatsoever

Prerequisites

To import a snippet into your project, you must import React and copy-paste the component's JavaScript code like this:

import React from 'react';

function MyComponent(props) {
  /* ... */
}

If there is any Style related to your component, copy-paste it to a new file with the same name and the appropriate extension, then import it like this:

import './MyComponentStyle';

Related projects

• 30 Seconds of Code
• 30 Seconds of CSS
• 30 Seconds of Interviews
• 30 Seconds of React

Table of Contents

Visual

View contents

• Ticker

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Visual

Ticker

Renders a ticker component.

• Use the React.useState() hook to initialize the ticker state variable to 0.
• Define two methods, tick and reset, that will periodically increment timer based on interval and reset interval respectively.
• Return a <View> with two <Button> elements, each of which calls tick and reset respectively.

function Ticker(props) {
  const [ticker, setTicker] = React.useState(0);
  let interval = null;

  const tick = () => {
    reset();
    interval = setInterval(() => {
      if (ticker < props.times) setTicker(ticker + 1);
      else clearInterval(interval);
    }, props.interval);
  };

  const reset = () => {
    setTicker(0);
    clearInterval(interval);
  };

  return (
    <View>
      <Text style={{ fontSize: 100 }}>{ticker}</Text>
      <Button onPress={tick} title="Tick!" />
      <Button onPress={reset} title="Reset!" />
    </View>
  );
}

Examples

<Ticker times={5} interval={1000} />

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