Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 months ago. Improve this question I am trying to use an array map for checking if same username and password exist in an object array Answer You may use find
Tag: map-function
Speed Up and Simplify MongoDB Aggregate Function
I have the following function, which is quite complicated, but i’m hoping someone might be able to understand it help me simplify/speed it up. In this function i end up with an array that contains a list of primaryStores and the number of products coming from each one to my group of stores. However, it only counts the products, if
Passing string from parent to render multiple children
I may lose something on the way.. I want to pass object arguments to a children to dinamically render it in three different ways. Here is my object: This is the children component: And then i have the parent component where i want to render multiple Card mapping the cards array: and then i receive this: Error: Objects are not
Extract the price only from api using node-fetch array
I am sorry for a basic question, I have been trying to extract only the price using node-fetch from API The error I am receiving is Please, any suggestion is greatly appreciated Answer There are several things that you need to check out Errors reagarding cjs/loader.js have little or nothing to do with your code per se but rather the
Why can I use comma at the end of the line in the following callback function inside the map function?
In javascript, I thought we aren’t allowed to end the line with comma if we were inside a closure. Why is the following code snippet an exception? And why does it not work if I put a comma after k.c = ‘asd’? Answer The following is an expression, with two uses of the comma operator: (the trailing semi-colon is optional
Mapping Array in Javascript with sequential numbers
The following code: Creates the following Array: I just don’t understand why. I can’t find anything on the internet that explains this behavior. Does anyone know why this works the way it does? Perhaps a link to some documentation? Answer creates an array of length 10 with all elements being undefined. will invoke Number.call for each element with the arguments
reduce function composed of map function in JavaScript
Say we have and want to reduce() it like Now, I want to compose reduce() function itself from map() function. How would you do that? What is the smartest way? Edit: In the comments and answers, many have claimed fold/reduce can compose map, in shallow level, that can be true, however, in category theory, fundamentally reduce/fold is generalized to Catamorphism
What is the difference between .map, .every, and .forEach?
I’ve always wondered what the difference between them were. They all seem to do the same thing… Answer The difference is in the return values. .map() returns a new Array of objects created by taking some action on the original item. .every() returns a boolean – true if every element in this array satisfies the provided testing function. An important