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Object.fromEntries


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


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


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


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


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


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


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


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...

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