react-native : picking random image using Math.floor

react-native : picking random image using Math.floor

I am trying to pick random image using Math.floor. I want to select image between 20 images that I assigned.

I have 20 images:

const randomImages = [
    require('../Components/Assets/blind1.png'),
    require('../Components/Assets/blind2.png'),
    require('../Components/Assets/blind3.png'),
    ... up to 20
];

Then, I try to select random image like this:

 selectedRandomImage(){
    const randomImage = randomImages[Math.floor((Math.random() * 19) + 1)]
    console.log(randomImage,'randomImage')
    return(
      <View>
        <Image
          style={{ width: 56, height: 56 }}
          source={randomImage} />
      </View>
    )
  }

My question: I get random Image using the code above but when I console.log(randomImage,'randomImage')

I get numbers over 20. Why is this? isn't it supposed to be under 20?.

When the number is over 20 I still get the random image though.


Math.random() generate number between 0 to 1 then Math.random() * 19 generate number between 0 to 19 and (Math.random() * 19) + 1 produce number between 1 to 20 but your array has 19 index and randomImages[20] return undefined

Displaying a Random Image, In this chapter from JavaScript: Visual QuickStart Guide, 9th Edition, you'll learn <title>Random Image</title> <script src="script10.js"></script> <link var randomNum = Math.floor(Math.random() * myPix.length); document. To generate random in react native application we are going to use JavaScript inbuilt function Math.floor () and Math.random () function is used in this tutorial. The Math.floor () function is used to round the given number to its downward integer value.


   const imageCollection =
    [
      require('App/assets/images/doe1.jpg'),
      require('App/assets/images/doe2.jpg'),
      require('App/assets/images/doe3.jpg'),
      require('App/assets/images/doe4.jpg'),
      require('App/assets/images/John-Doe.jpg'),
      require('App/assets/images/John-Doe.jpg'),
    ];

    const getRandomImage = () => 
      imageCollection[Math.floor(Math.random() * imageCollection.length)];

Would be a better approach as the function is aware of the length of the images array and will update accordingly.

Display a Random Image Using JavaScript, function getRandomImage(imgAr, path) { path = path || 'images/'; // default path here var num = Math.floor( Math.random() * imgAr.length ); var img = imgAr[ num ]​  Your random number generator will generate a number between 0-1. To make it generate a number between 0-5 (1-6, but remember to subtract one since this is the index of your array), use this snippet: var num = Math.floor(Math.random() * 5); You need to add an onClick attribute to your button element.


randomImage variable have some random image path from randomImages array.

require("path to image") returns the number mapped to image. react native maps unique numbers to static images and that's why when you try to log, it is giving number over 20.

But, if you try to log Math.floor((Math.random() * 19) + 1) value, it will be below 20.

React Native Generate Random Number Between 1 to 100 in , The Math.random() function is used to Generate Random Number to any range in Point Float value. So we would use both Math.floor() and  Var random = images [Math.floor (Math.random () * images.length)]; This will generate you a random value from array, write it in a function and bind it to button.


JavaScript DOM: Display a random image by clicking on a button , home Front End HTML CSS JavaScript HTML5 Schema.org php.js Twitter Write a JavaScript program to display a random image (clicking on a button) number function getRandomInt(min,max) { // return Math.floor(Math.random() JavaScript Framework · React - JavaScript Library · Vue - JavaScript  This is a tutorial for programming BEGINNERS. This tutorial will show you how to use JavaScript: Math.random(). We will use Math.random to display images at random on a webpage.


Picking a Random Item from an Array, floor(Math.random() * myShows.length)];. If you run this code, your show variable will store the name of a randomly  I know that to use a static image in react native you need to do a require to that image specifically, but I am trying to load a random image based on a number. For example I have 100 images called img1.png - img100.png in my directory. I am trying to figure out a way to do the following


Select Random Item from an Array, var myArray = ; var randomItem = myArray; See the Pen gLJPZv by Chris var randomItem = myArray[Math.floor(Math.random()*myArray.length)]; from React to CSS, from Vue to D3, and beyond with Node.js and Full Stack. This tutorial is very simple but interesting for beginners who wish to Dynamically Generate Random Color on button onPress in react native android and iOS application example tutorial in RGB color format by calling a function.