Find the number of days in a month using JavaScript
Calculate the number of days in a month for a given year using JavaScript.
JavaScript Articles
The JavaScript article collection contains a wide variety of ES6 helper functions. It includes helpers for dealing with primitives, arrays and objects, as well as algorithms, DOM manipulation functions and Node.js utilities.
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JavaScript · Date of yesterday, today or tomorrow in JavaScript
Easily calculate the date of yesterday, today or tomorrow in JavaScript.
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JavaScript · Convert between binary and decimal numbers in JavaScript
Binary numbers are a fundamental part of computer science. Learn how to convert between binary and decimal numbers in JavaScript.
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JavaScript · Typechecking JavaScript arrays with Array.isArray()
Make sure to use the correct method when checking if a JavaScript object is an array.
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JavaScript · Check if a string contains a substring in JavaScript
Let's have a look at how to check if a string contains a substring in JavaScript.
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JavaScript · Minimize DOM access in JavaScript
Increase your JavaScript code's performance when working with the DOM by leveraging this simple trick.
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JavaScript · Is there a way to use instanceof for primitive JavaScript values?
JavaScript's
instanceofoperator can't be used with primitive values, but there are a some tricks that you can leverage to your advantage. -
JavaScript · Can I check if a JavaScript string contains a substring, regardless of case?
Search for substrings in JavaScript strings without worrying about case sensitivity.
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JavaScript · How can I get the currently selected text in the browser?
Learn how to get the currently selected text in the browser using JavaScript.
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JavaScript · Use JavaScript for loops if you need to break out early
Iteration in JavaScript can be done a handfuld of ways, most often using array methods, but sometimes a
forloop is the best option. -
JavaScript · Faster element removal in unordered JavaScript arrays
Are you performing a lot of array operations? Maybe element removal is a performance bottleneck you can avoid.
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JavaScript · Convert a tilde path to an absolute path in Node.js
Ever wanted to convert a tilde path to an absolute path? Here's how you can do it in JavaScript.
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JavaScript · Check if two JavaScript arrays have same contents
Learn how to compare the contents of two arrays to see if they contain the same elements regardless of order.
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JavaScript · Convert a string to a boolean
Have you ever tried to convert the string representation of a boolean to an actual boolean value? Here's a simple way to do it.
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JavaScript · Check if a JavaScript string is a valid JSON
Use a simple JavaScript trick to validate a serialized JSON object.
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JavaScript · What does a JavaScript constructor return?
The constructor is a crucial part of any JavaScript class, which is why you might want to take a closer look at what they return.
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JavaScript · Create your own query selector shorthand in vanilla JavaScript
Ever wanted to create your own jquery-like query selector shorthand? Here's how!
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JavaScript · Percentile of matches in a JavaScript array
Calculate the percentage of numbers in the given array that are less or equal to the given value.
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JavaScript · Offset elements in a JavaScript array
Ever needed to move some elements to the end of an array? Here's a simple way to do it.
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JavaScript · Mask a JavaScript value
Replace all characters in a string, except for the ending characters, with a mask character.
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JavaScript · Initialize a JavaScript array with the specified values
Initialize and fill a JavaScript array with the specified values, quickly and easily.
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JavaScript · Determine if a JavaScript date is a weekday or weekend
Quickly and easily determine if a given JavaScript
Dateobject is a weekday or weekend. -
JavaScript · 6 JavaScript Regular Expression features you can use today
Learn how to level up your regular expressions game, with features such as backreferences, lookaheads and named groups.
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JavaScript · Transpose a matrix in JavaScript
Learn how to transpose a two-dimensional array in JavaScript.