nessie | An NES emulator written in JavaScript | Video Game library
kandi X-RAY | nessie Summary
kandi X-RAY | nessie Summary
An NES emulator written in JavaScript
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Top functions reviewed by kandi - BETA
- arr is an array
- Rotate the right shift .
- Rotates the current block .
- Opens the matrix .
- Add a counter with another value
- Shift the left bit number .
- Shift the right shift to 1 .
- Opens a mem address .
- Opens a mem address .
- Basis script
nessie Key Features
nessie Examples and Code Snippets
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QUESTION
Overview:
I've created bit of jQuery that randomizes (4) images in a folder, within an array on click. This is working, but I cannot track down why "undefinied" is returned on the image URL string randomly, creating a broken image link.
Goal:
I am looking for a way to tell my function there are only 4 images, and of course - stop randomly returning "undefined". It would also be nice if it didn't repeat the same image twice in two clicks, but this is out of scope of the request I suspect - if so ignore.
Note: sometimes you have to click through a bit to get it to break.
Thank you!
...ANSWER
Answered 2020-Apr-16 at 19:05Your randomizer implementation (Math.round(Math.random() * myImages.length-1)
) is returning -1 sometimes. This results in accessing index -1 of the myImages
array which is undefined
.
What you want is Math.floor(Math.random()*myImages.length)
. This will result in indexes from 0 through 3 for your myImages
array of length 4. This is because Math.random returns 0 to 1 (0 inclusive and 1 exclusive).
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