Jos de Jong josdejong

josdejong / detectFont.ts

Created October 9, 2025 12:05

A JavaScript function to test whether a font is supported or not

	/**
	* Usage:
	*
	* detectFont('arial') // true
	*/
	function detectFont(fontName: string) : boolean {
	const canvas = window.document.createElement('canvas')
	const context = canvas.getContext('2d')
	const text = 'i' // this text has a different width for monospace and sans-serif

josdejong / npm.js

Last active July 15, 2025 15:19

Helper function to load ESM packages from NPM in your browser dev tools console

	/**
	* Load an ESM package from npm in your JavaScript environment.
	*
	* Loads packages from https://www.npmjs.com/ via the CDN https://www.jsdelivr.com/
	*
	* Usage:
	*
	* const lodash = await npm('lodash-es')
	* const lodash = await npm('lodash-es@4')
	* const lodash = await npm('[email protected]')

josdejong / merge.kt

Last active July 30, 2025 05:53

Merge two data classes in Kotlin

	import kotlin.reflect.full.declaredMemberProperties
	import kotlin.reflect.full.primaryConstructor

	/**
	* Merge two data classes
	*
	* The resulting data class will contain:
	* - all fields of `other` which are non null
	* - the fields of `this` for the fields which are null in `other`
	*

josdejong / package.json

Last active August 29, 2015 14:22

Test ES7 async/await

josdejong / gist:4537647

Last active September 27, 2022 22:55

String interpolation method for underscore.js.

	/*
	String interpolation method for underscore.js

	Usage:
	var props = {
	first: 'Jos',
	last: 'de Jong'
	};
	var message = _.interpolate('Hello $first $last, welcome!', props);