Author: Mark
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Making a number only text input
On your input add this This will only allow number characters This will allow 1 decimal to be added in addition to numbers
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How to export an apk file for testing
In the terminal run these commands: Then the apk file is here:
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How to fix NativeEventEmitter warning
I was getting the warning: new NativeEventEmitter() was called with a non-null argument without the required removeListeners method. I was using React Native Sound and to fix the warning I add the below lines of code to this file in the react-native-sound module: react-native-sound/android/src/main/java/com/zmxv/RNSound/RNSoundModule.java
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Copying a state variable’s value
To copy the value of a variable declared using useState, if it’s an array use: let varName = […stateVar]; If it’s not an array use: let varName = stateVar.valueOf();
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Creating an array of empty arrays
If you do: let arr = new Array(5); arr.fill([]); This will make an array of 5 identical arrays where editing one will update all which is rarely what anyone wants. To achieve an array of different arrays use: let arr = Array.from(new Array(5), () => [])
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Update all dependencies in package.json to latest
To do this, use npm-check-updates Install with Then update with
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Accessible hash links
This is mainly for the ‘skip to content’ links. $(“a[href^=’#’]”).not(“a[href]=’#'”).click(function() { $(“#”+$(this).attr(“href”).slice(1)+””).focus(); });
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Difference between var, let and const
var declarations are globally scoped or function scoped while let and const are block scoped. This means you can declare the a let or const with the same name inside an if statement and it will be self contained. The console would log “aa bb” followed by “a b”. Let and const can’t be redeclared in…
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Difference between document.ready and window.onload
Triggers when the HTML is ready. Use this to start running code as soon as possible. This is not jQuery. Trigger when everything on the page (eg images) is finished loading.
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CSS Modules
CSS modules allow you to create unique class names even when the class is already used in another file. Name the file like so: name.module.css. Right normal css in it. Import the file like so: Apply it to an element like so: where testClass is a class specified in your css module file. When the…