Find matching keys in a JavaScript object
Find all the keys in a JavaScript object that match the given value.
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.
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JavaScript · -
JavaScript · Check if a string is a yes/no answer with JavaScript
Quickly and easily check if a string is a yes/no answer to a boolean question in your CLI programs.
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JavaScript · Immutability in functional programming
Immutability is a fundamental concept you should be familiar with when learning functional programming.
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JavaScript · Capitalize the first letter of a JavaScript string
Learn how to capitalize the first letter of a string in JavaScript using array destructuring and
String.prototype.toUpperCase(). -
HTML · Use data attributes instead of HTML classes to represent state
Learn how to use data attributes to represent UI state and level up your HTML and CSS game.
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JavaScript · Create a unit converter data structure in JavaScript
Learn how to create a unit converter data structure in JavaScript that can convert between any compatible units.
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JavaScript · Split a JavaScript array into chunks
Chunk an array or iterable into arrays of a specified size or a given number of chunks.
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JavaScript · Truth check all values in a JavaScript array
Learn how to check if all values in an array are true or false.
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JavaScript · Detect user color scheme preference in JavaScript
Use a media query to check if the user prefers a light or dark color scheme.
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JavaScript · How can I listen for a click outside of an element in JavaScript?
Detect and handle click events outside of a specific element in just a few lines of JavaScript.
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JavaScript · Programmatically trigger event on HTML element using JavaScript
Learn how to trigger an event on an HTML element using JavaScript.
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JavaScript · How can I listen for an event only once in JavaScript?
Learn how to add an event listener that is executed at most once.
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JavaScript · Add or remove an event listener in JavaScript
Learn how to add or remove event listeners from elements with ease.
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JavaScript · How can I generate all partial substrings of a string in JavaScript?
Get all the partial substrings of a string in JavaScript using generator functions.
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JavaScript · Remove elements from a JavaScript array without mutating it
Did you know that implementing a non-mutating version of
Array.prototype.splice()is only a few lines of code? -
JavaScript · Show or hide HTML elements with JavaScript
Ever wanted to show or hide one or more elements in HTML, using JavaScript? Turns out it's very easy to do so.
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JavaScript · Remove attributes from an HTML element with JavaScript
A simple trick to remove one or more attributes from an HTML element.
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JavaScript · Use JavaScript to prefix a CSS property based on the browser
Not sure if you need to prefix a CSS property in order to use it? Here's a simple way to figure it out!
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JavaScript · How can I get the current URL in JavaScript?
Learn a simple way to get the browser's current URL in JavaScript.
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JavaScript · How can I redirect the page to HTTPS in JavaScript?
Learn how to redirect the page to HTTPS if it's currently in HTTP.
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JavaScript · Run JavaScript promises in series
Learn how to resolve promises one after another (sequentially) in JavaScript.
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JavaScript · Debounce a JavaScript function and return a promise
Easily create a debounced function that returns a promise.
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JavaScript · Debounce a JavaScript function
Create a debounced function that waits a certain amount of time before invoking the provided function again.
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JavaScript · Iterate over a JavaScript array from right to left
Learn how to execute a function for each element of an array, starting from the last one.