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JavaScript Glossary: String match()
27.3.2019
Basics
This method is a called against a regular expression and returns the matching values in the string. The return value is an array containing the matched values. If no matches are fo
JavaScript Glossary: String startsWith()
27.3.2019
Basics
The startsWith method takes a string parameter and checks if the calling string starts with the value provided. It returns a Boolean value, true
JavaScript Glossary: String toLowerCase()
26.3.2019
Basics
The toLowerCase() String method converts a string object to lower case. The return value of the method is the value of the calling string in lower case
An Illustrated (and Musical) Guide to Map, Reduce, and Filter Array Methods
26.3.2019
Map, reduce, and filter are three very useful array methods in JavaScript that give developers a ton of power in a short amount of space. Let’s jump right into how you can leverage (and remember how to use!) these super handy methods.
Array.map()
Array.map() updates each individual value in...
CSS Algorithms
6.3.2019
I wouldn't say the term "CSS algorithm" has widespread usage yet, but I think Lara Schenck might be onto something. She defines it as:
a well-defined declaration or set of declarations that produces a specific styling output
So a CSS algorithm isn't really a component where there is some parent...
Dealing with overflow and position: sticky;
25.2.2019
Any overflow value other than visible and no height is the enemy of child elements with position: sticky;. It's like that element is ready to stick when the parent scrolls, but it never does because the height is unconstrained. Adding a fixed height can solve the issue, but that's not always...
How @supports Works
18.2.2019
CSS has a neat feature that allows us to test if the browser supports a particular property or property:value combination before applying a block of styles — like how a @media query matches when, say, the width of the browser window is narrower than some specified size and then the CSS within...
JavaScript Glossary: Array .push() Method
8.2.2019
Basics
This methods appends one or more value to the last position of an array. This method mutates the array returning the new length of the array.
let
JavaScript Glossary: Array .includes() Method
8.2.2019
Basics
This method checks if an array contains a given element. The return value for this method is a Boolean. true if the element exists in the array and f
The practical value of semantic HTML
7.1.2019
I love how Bruce steps up to the plate here:
If the importance of good HTML isn’t well-understood by the newer breed of JavaScript developers, then it’s my job as a DOWF (Dull Old Web Fart) to explain it.
Then he points out some very practical situations in which good HTML brings meaningful...
An Initial Implementation of clip-path: path();
24.12.2018
One thing that has long surprised (and saddened) me is that the clip-path property, as awesome as it is, only takes a few values. The circle() and ellipse() functions are nice, but hiding overflows and rounding with border-radius generally helps there already. Perhaps the most useful value...
Fighting FOIT and FOUT Together
19.12.2018
Lots from Divya with the setup:
There are 2 kinds of problems that can arise when using webfonts; Flash of invisible text (FOIT) and Flash of Unstyled Text (FOUT) ... If we were to compare them, FOUT is of course the lesser of the two evils
If you wanna fight FOIT, the easiest tool is...
Object.fromEntries
9.11.2018
The Object object has been buffed with useful methods over the past few years. Object.keys, Object.values, Object.freeze, and Object.assign all address frequently desired functionality. One of the new Object methods is fromEntries, which accepts a Map or map-like array nesting and converts it...
Realtime Cryptocurrency Rates API with coinlayer
24.7.2018
Last year when cryptocurrencies were gaining massively in value each month, I badly wanted to create a personal web project which would let me quickly buy and sell crypto outside of brokers like Coinbase; the problem I ran into was not having a reliable API for doing so. I recently discovered...
Getting Started with JavaScript Object
2.7.2018
An object is a type of data in JavaScript. It's the only value you can pass around as variables besides primitives. For this reason, objects are really important in JavaScript.
What are obj
Users DO Change Font Size
24.6.2018
Evan Minto:
The question was “How many users browse the main Internet Archive site with a default font size other than the common value of 16 pixels?” By knowing this, we would determine how many users would be affected by sizing with relative units like rems/ems.
Using the methodology I describe...
Understanding the Almighty Reducer
13.6.2018
I was reently mentoring someone who had trouble with the .reduce() method in JavaScript. Namely, how you get from this:
const nums = [1, 2, 3]
let value = 0
for (let i = 0; i < nums.length; i++) {
value += nums[i]
}
...to this:
const nums = [1, 2, 3]
const value = nums.reduce((ac, next)...
Přednáška o metaprogramování ve Swiftu
11.5.2018
Určitě jste již zažili error “Unexpectedly found nil while unwrapping an Optional value”, když jste se pokoušeli inicializovat UIImage pomocí názvu obrázku, ve kterém jste měli překlep. Nebylo by fajn mít statickou množinu…
Overriding Default Button Styles
9.5.2018
There are a variety of "buttons" in HTML. You've got:
<button>Button</button>
<input type="button" value="Button">
Plus, for better or worse, people like having links that are styled to match the look of other true buttons on the site
<a href="#0"...
Animating Progress
30.4.2018
Jonathan Snook on the complexity of animating the <progress> element. If you’re unfamiliar, that’s the element that spits out a bar chart-like visual that indicates a position between two values:
This example has custom styles, but you get the point.
Jonathan's post shows off a method...