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Tag: key

Is there a way to call a function by a key press in Javascript?

JavaScript February 27, 2021

Is there a way to call a function on the event of a key press. My goal is to make a movable block and I was wondering if you could call the function to move a

block around. I also have an …

How to access the dictionary values from classes in python?

Python January 19, 2021

I am trying to use classes to create a dictionary using the following code: import numpy as np import collections class Graph: def __init__(self): self.graph = collections.defaultdict(…

Why list items need unique key, but other not, in react?

React JS January 13, 2021

Why do rendering list items need to pass a key prop while other elements don’t? For example, if I do like – [‘apple’, ‘orange’, ‘lemon’].map((fruit, i) => { return

  • {fruit}
  • Rearrange / transpose array items by keys diagonally in JavaScript

    JavaScript December 12, 2020

    I have an array of strings, for example: var arr=[“dog”, “cat”, “bear”, “wolf”, “lynx”, “hare”, “sheep”, “owl”, “…

    get dictionary value by key

    C# August 29, 2012

    How can I get the dictionary value by key on function? My function code (and the command I try doesn’t work): static void XML_Array(Dictionary Data_Array) { String xmlfile = …

    What is the best way to use two keys with a std::map?

    C++ July 11, 2009

    I have a std::map that I’m using to store values for x and y coordinates. My data is very sparse, so I don’t want to use arrays or vectors, which would result in a massive waste of memory. My data …

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