Ways to clear an existing array A: Method 1 (this was my original answer to the question) This code will set the variable A to a new empty array. This is perfect if you don’t have references to the original array A anywhere else because this actually creates a brand new (empty) array. You should be careful with this method because … Read more
You are calling ReactDOM.render within a React component that doesn’t get rendered. Call ReactDOM render outside of the class definition for help To render your button to the screen: That’s it. To avoid confusion should try and give your components meaningful names. Naming both of them Help can get confusing when you are trying to import one … Read more
Use location.reload(): The reload() function takes an optional parameter that can be set to true to force a reload from the server rather than the cache. The parameter defaults to false, so by default the page may reload from the browser’s cache.
Check out the built-in function encodeURIComponent(str) and encodeURI(str).In your case, this should work:
To do this for any object in JavaScript will not be simple or straightforward. You will run into the problem of erroneously picking up attributes from the object’s prototype that should be left in the prototype and not copied to the new instance. If, for instance, you are adding a clone method to Object.prototype, as some answers depict, … Read more
These solutions will work: or or even Note that the last option is a better way to go since it is unobstrusive and is considered more standard.
Q: Is this ok?A: yes Q: Is this expected?Yes, this is expected (if you are using react-redux). Q: Is this an anti-pattern?A: No, this is not an anti-pattern. It’s called “connecting” your component or “making it smart”. It’s by design. It allows you to decouple your component from your state an additional time which increases the modularity of … Read more
Use instead of
It is good programming practice to return an empty array [] if the expected return type is an array. This makes sure that the receiver of the json can treat the value as an array immediately without having to first check for null. It’s the same way with empty objects using open-closed braces {}. Strings, Booleans and integers … Read more
Think of it like you’re just calling JavaScript functions. You can’t use a for loop where the arguments to a function call would go: See how the function tbody is being passed a for loop as an argument – leading to a syntax error. But you can make an array, and then pass that in as an argument: You can basically … Read more