dangerouslySetInnerHTMLPublished on in JavaScript, React and TypeScript
Last updated on
To handle internal link clicks when using dangerouslySetInnerHTML,
attach click event listeners to the rendered links.
In the listener, push the link to the browser history.
conditional()Published on in JavaScript
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Use { is: Joi.any().valid(...values) }
to check if a value is included in an array.
.mts is a cool file extension (TypeScript ES modules)Published on in JavaScript, Node.js and TypeScript
What's that, a file extension named after me?! Or a file extension for TypeScript files that are always ES modules?
compose() is right-to-leftPublished on in JavaScript
Functions composed together with compose()
are called from right to left.
It feels unintuitive at first,
but it's conventional
and kind of makes sense.
Published on in JavaScript, Mithril.js, Rant and React
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React's ecosystem is large, which is a good thing: lot's of great libraries to use. But it's also a bad thing: most of those libraries are compatible only with React.
Published on in JavaScript and React
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HTM provides a transpiler-free alternative to JSX via tagged templates. HTM has some limitations, but can be used in browsers and can be good for smaller projects.
Published on in JavaScript
Fun way to solve the simple puzzle.
Infinitely repeating arrays
and mapping over multiple arrays
almost makes the remainder/modulo operator (%) unnecessary.
Published on in JavaScript and TypeScript
Using recursion,
logical OR assignment operator (||=),
BigInts
and more!
Published on in Episerver, JavaScript and React
Last updated on
Also known as Episerver/Idio Content Recommendations. The usual way of using a Mustache template can be circumvented by using a JavaScript proxy.
Published on in JavaScript
Spoiler:
new Date(year, 1, 29).getDate() === 29.
Published on in JavaScript and Mithril.js
Last updated on
Create a DocumentFragment
and render the component to it.
Then there's no need to mount the component to the DOM.
Published on in JavaScript and Mithril.js
Last updated on
Disable auto-redraw with event.redraw = false
and use a timeout.
Published on in JavaScript and Mithril.js
Last updated on
m.nest('ul > li', 'Item')
can be achieved with reduceRight().
Intl.ListFormatPublished on in JavaScript
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Pass an array of strings and get back a string with the array items separated by commas, except with the last comma replaced with the word "and" or "or." Like "item 1, item 2 and item 3."
Published on in JavaScript
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Run JSON.stringify(object, null, 2).
Adjust the number for a different level of indentation.
Published on in JavaScript and Regular expressions
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How to convert
'/foo/bar/baz/'
into an array of
'/', '/foo/', '/foo/bar/', and '/foo/bar/baz/'.
Example use case: building breadcrumb navigations.
Date() constructor is bad at parsing datesPublished on in JavaScript
Last updated on
And Date.parse() too.
They are strongly discouraged
due to browser differences and inconsistencies.
Use only proper date time formats
or use a library for parsing fancy formats.
Published on in JavaScript
Last updated on
The error is thrown when calling a function
whose this keyword isn't referring to the object where it originally did,
i.e. when the "context" of the function is lost.
array.shift() vs array.unshift() in JavaScriptPublished on in JavaScript and Mnemonics
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shift() removes the first array item,
and unshift() prepends items to the array.
But how to remember which is which?
toLocaleString() in Node.jsPublished on in JavaScript, Node.js and npm
Last updated on
With Node.js 13+,
it should just work.
With earlier Node.js versions,
you need to install and use the full-icu package.
Published on in JavaScript
JavaScript doesn't provide a native way to get the week number of a date. Just use a library instead.
Published on in JavaScript and Regular expressions
Last updated on
E.g. how to capture overlapping pairs of letters from the string 'abcde',
i.e. 'ab', 'bc', 'cd' and 'de'.
Spoiler: with lookahead and lookbehind assertions.
fn.apply() vs fn.call() in JavaScript + better alternativePublished on in JavaScript and Mnemonics
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Mnemonic:
"a" (apply()) for an array,
"c" (call()) for commas.
But Reflect.apply() is better.
Published on in JavaScript and React
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If you need form input values only at the time of form submission, uncontrolled inputs can be nice to work with.
Published on in JavaScript
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My quick notes on a funny but informative video (11:27) that explains how tail call optimization (TCO) works. Bonus: does JS support TCO? Spoiler: yes but no.
Published on in JavaScript
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A simple reducer to chunk (split) an array into smaller arrays.
Published on in C#, Episerver and JavaScript
Requests with the Accept header set to application/json
are automatically routed to Content Delivery API.
Here's how to bypass it
and make the request go to a page controller instead.
Published on in JavaScript, Mithril.js and React
Last updated on
JSX is just JS under the hood.
Hyperscript is like that JS,
but better.
Example:
h('a.link', { href }, 'Click me')
is nicer than
<a className="link" href={href}>Click me</a>,
right? Right?!