How do I merge two arrays in JavaScript?
Arrays are one of the most used data types in any programming language. Learn how to merge two arrays in JavaScript with this short guide.
Code Articles
30 seconds of code contains a curated collection of code articles covering a wide range of development needs. The collection spans many topics, ranging from simple coding problems to theoretical concepts and development techniques.
-
JavaScript · -
JavaScript · Iterate over a JavaScript object's own properties
Iterate over all own properties of an object, running a callback for each one.
-
JavaScript · Check if a value is a valid JavaScript date
Learn how you can check if a valid date object can be created from the given values.
-
JavaScript · How can I find the insertion index of an element in a sorted JavaScript array?
Given a sorted array, find the correct index to insert a given value.
-
JavaScript · Find all indexes of a substring in a JavaScript string
Create a generator function that finds all the indexes of a substring in a given string.
-
JavaScript · Chaining dynamic getters using the Proxy object
Using the Proxy object, we can create chainable dynamic getters for objects in JavaScript.
-
JavaScript · JavaScript Data Structures - Stack
A stack is a linear data structure which follows a last in, first out (LIFO) order of operations.
-
JavaScript · Check if a JavaScript array has only one or many matches
Learn how to check if an array has one or more values matching the given function, and how to find the matching elements.
-
HTML · Recommended minimum HTML head
Ensure your HTML documents are properly structured by including these lines in your
<head>element. -
CSS · Animate box shadow on hover
Create an animated shadow box around the text when it is hovered.
-
React · An approach to testing stateful React components
Testing stateful React components is not difficult, but did you know there's a solution that doesn't involve testing state directly?
-
JavaScript · What does 'use strict' do and what are some of the key benefits to using it?
JavaScript's strict mode can make your code faster, cleaner and more secure.
-
JavaScript · Unwind a JavaScript object
Create an array of objects from an object and one of its array-valued properties.
-
JavaScript · Typechecking objects with Proxy in JavaScript
Learn how to type check objects at runtime using the powerful Proxy object in JavaScript.
-
JavaScript · Remove matching elements from a JavaScript array
Given a predicate function, remove elements from an array that match the given condition.
-
JavaScript · Insertion sort
Sort an array of numbers, using the insertion sort algorithm.
-
JavaScript · Initialize a JavaScript array with a given numeric range
Learn how to create an inclusive array with numbers in a range, using a common
stepdifference. -
JavaScript · Immutability in functional programming
Immutability is a fundamental concept you should be familiar with when learning functional programming.
-
JavaScript · Function composition in JavaScript
Understand the basics of function composition, a fundamental concept in functional programming.
-
JavaScript · Creating HTML elements in JavaScript
Learn how to create HTML elements in JavaScript, by abstracting the creation logic into a function.
-
JavaScript · Is JavaScript's array sorting stable?
Understand why JavaScript's built-in array sorting is not stable and how to implement a stable sorting algorithm.
-
CSS · What are CSS variables and where can I use them?
Learn how CSS custom properties (CSS variables) work and what you can use them for in your code and designs.
-
CSS · Shake input field when invalid, using CSS
Inform your users of invalid input by shaking the input field.
-
CSS · Horizontal or vertical scroll snap in CSS
Create a horizontally or vertically scrollable container that will snap on elements when scrolling.