| //Dijkstra algorithm is used to find the shortest distance between two nodes inside a valid weighted graph. Often used in Google Maps, Network Router etc. | |
| //helper class for PriorityQueue | |
| class Node { | |
| constructor(val, priority) { | |
| this.val = val; | |
| this.priority = priority; | |
| } | |
| } |
| function noteFromKey(keyCode) { | |
| var char = String.fromCharCode(keyCode).toUpperCase(); | |
| if(pianoMap[char]) { | |
| return pianoMap[char]; | |
| } | |
| else { | |
| return false; | |
| } | |
| } | |
| /* |
| // Helpers.js | |
| // A reliable alternative to `typeof`: | |
| const type = v => Array.isArray(v) ? 'array' : Object.prototype.toString.call(v).slice(8, -1).toLowerCase(); | |
| // More type checking | |
| const isType = (v,t) => type(v) === t; | |
| const isFn = v => isType(v, 'function'); | |
| const isObj = v => isType(v, 'object'); | |
| const isNum = v => isType(v, 'number'); |
| # extracted from http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_countries.zip | |
| # under public domain terms | |
| country_bounding_boxes = { | |
| 'AF': ('Afghanistan', (60.5284298033, 29.318572496, 75.1580277851, 38.4862816432)), | |
| 'AO': ('Angola', (11.6400960629, -17.9306364885, 24.0799052263, -4.43802336998)), | |
| 'AL': ('Albania', (19.3044861183, 39.624997667, 21.0200403175, 42.6882473822)), | |
| 'AE': ('United Arab Emirates', (51.5795186705, 22.4969475367, 56.3968473651, 26.055464179)), | |
| 'AR': ('Argentina', (-73.4154357571, -55.25, -53.628348965, -21.8323104794)), | |
| 'AM': ('Armenia', (43.5827458026, 38.7412014837, 46.5057198423, 41.2481285671)), |
Convert SVG to canvas on-the-fly.
This article from MDN explains the process: Drawing DOM object into a canvas. This works for any DOM object, not just SVG. Not sure if this is well supported by older browsers. Works on Chrome, Firefox and IE 10 for me. The bar chart is a fork of this block by Mike Bostock: Canvas Bar Chart.
⇐ back to the gist-blog at jrw.fi
Or, 16 cool things you may not have known your stylesheets could do. I'd rather have kept it to a nice round number like 10, but they just kept coming. Sorry.
I've been using SCSS/SASS for most of my styling work since 2009, and I'm a huge fan of Compass (by the great @chriseppstein). It really helped many of us through the darkest cross-browser crap. Even though browsers are increasingly playing nice with CSS, another problem has become very topical: managing the complexity in stylesheets as our in-browser apps get larger and larger. SCSS is an indispensable tool for dealing with this.
This isn't an introduction to the language by a long shot; many things probably won't make sense unless you have some SCSS under your belt already. That said, if you're not yet comfy with the basics, check out the aweso
| // ---- | |
| // Sass (v3.4.21) | |
| // Compass (v1.0.3) | |
| // ---- | |
| // Sass modifiers mixin by Sarah Dayan | |
| // Generate All Your Utility Classes with Sass Maps: frontstuff.io/generate-all-your-utility-classes-with-sass-maps | |
| // http://frontstuff.io | |
| // https://github.com/sarahdayan |
| // NOTE: | |
| // ---------------------------------------------------------------------------- | |
| // | |
| // ** When a key/value structure is needed, Map should be preferred to Object. ** | |
| // | |
| // It’s possible to create Objects in JavaScript that don’t have a prototype. | |
| // It requires the usage of Object.create(). Objects created through this | |
| // API won’t have the __proto__ and constructor attributes. | |
| // "Prototype pollution" attacks |