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Tag: methods
why js can’t run method as a function
javascript error: Uncaught TypeError: Array.prototype.indexOf called on null or undefined but this works And in python. This works. So why the first way failed? Answer indexOf requires a this value of an array. Passing is the same as passing Array.prototype.indexOf: A similar one: Passing it as a callback ins…
Why the element gets back to first position after animate?
I’m using the animate method for my image created in JavaScript to slide into the .slider-wrapper, it does slide but it jumps back to the first position set for it before the animate method which is not what I want, I want the image to animate and stay there at the new position, not get back to the firs…
combination of OPTIONAL CHAINING and NULLISH COALESCING operator not rendering the expected result
i am just learning about this combo of Optional chain and Nullish coalescing. Here is the object as i am trying to check if the method exist,it is printing out both of them anyway.what am i doing wrong? Answer Perhaps return a value from the function otherwise it has an undefined value:
What method to use to access multiple objects in an array?
I’m new to javascript and still learning them. So I was building a project where I want to display a multiple object, which I put it in an array, to the DOM. I am not sure what method to use to access the object inside the array. This is my js file: So I kind of want to display all
Why am I only getting back the results of my final ‘hasOwnProperty’ call?
I am just wondering why when I call the ‘hasOwnProperty’ method multiple times, I am only being returned one boolean value in the console? It is always the final call that returns. The rest of my code is fully functional and if I switch round the order I call to check on where the 3 properties are…
How to call method inside main Component from outside in Reactjs
I need to call cancelMethod with params from Button onClick inside popover. However I could not access this method. Can you explain is it possible to access. If yes how can I do it? Answer You can define the functions Popover and Event within the class and the call the function with this keyword.
Javascript shorthand to call method if object exists
I have a variable and if that variable is a object I would like to call a method on that object, if not I want to do nothing. I’m wondering if there is any reason why I shouldn’t do it like this. Answer The quick answer is yes, foo && foo.bar() won’t throw an exception if foo is null…
multiple conditions for JavaScript .includes() method
Just wondering, is there a way to add multiple conditions to a .includes method, for example: Imagine the comma states “or”. It’s asking now if the string contains hello, hi or howdy. So only if one, and only one of the conditions is true. Is there a method of doing that? Answer That should …
Details about window.stop()
I just came across the window.stop() The stop() method is exactly equivalent to clicking the stop button in the browser. Because of the order in which scripts are loaded, the stop() method cannot stop the document in which it is contained from loading, but it will stop the loading of large images, new windows…