+
++ +**Update (Jan 2019):** io.js has already been merged into Node.js since v4, and is now considered deprecated. Consider using nodejs instead. + ++ +
++ +**Update (Dec 2019):** Node.js now supports [top-level await](https://v8.dev/features/top-level-await) which would solve the pain point outlined in this article. This article was written in 2015 with Node.js v0.12 in mind. + ++ +Consider this scenario: there's a strange bug in production's data that you need to inspect. In Rails, you can tell `rails console`: "show me all project IDs that are active and made by users that never logged in" like so: + +```ruby +pry(main)> User.where(last_signed_in: null) + .map { |u| u.projects.active } + .flatten + .pluck :id +``` + +This may not be the most efficient way to do it, but some situations are urgent and will call for one-offs like these. + +In Node.js, you'll probably do something like this: + +```js +> User.where({ last_signed_in: null }) + .fetch().then(function (users) { + return Promise.all(users.map(function(u){ + return u.projects.active.fetch(); + })) + }) + .then(function(projects) { + return projects.map(function(p) { + return p.id; + }); + }) + .then(console.log) +``` + +Ah, granted that promises and ES6 (fat arrows) would make this better, but still... diff --git a/posts/2015/javascript-shortcuts.md.disabled b/posts/2015/javascript-shortcuts.md.disabled new file mode 100644 index 00000000..480eaff7 --- /dev/null +++ b/posts/2015/javascript-shortcuts.md.disabled @@ -0,0 +1,29 @@ +--- +date: '2015-03-20' +title: JavaScript shortcuts using bitwise operators +description: Learn some shorter ways to write some common JavaScript expressions. +tags: [JavaScript] +layout: simple +--- + +Some common operations can be made shorter using bitwise operators. Here are some of my favorites. + +### Rounding off a number + +`Math.floor(3.5)` can be written as `3.5|0`. The [Bitwise OR](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_OR) operator will make an integer out of the number, and this construct is in fact used in [asm.js](http://asmjs.org/spec/latest/) to denote an integer. + +```js +list[list.length * Math.random() | 0] +// ...same as: +list[Math.floor(list.length * Math.random()] +``` + +### Checking for -1 + +The [Bitwise NOT](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Bitwise_NOT) operator will turn `-1` into zero. This makes substring checks with `indexOf()` a little shorter. + +```js +if (~string.indexOf("John")) { ... } +// ...same as: +if (string.indexOf("John") !== -1) { ... } +``` diff --git a/posts/2015/local-google-fonts.md.disabled b/posts/2015/local-google-fonts.md.disabled new file mode 100644 index 00000000..14adbde0 --- /dev/null +++ b/posts/2015/local-google-fonts.md.disabled @@ -0,0 +1,27 @@ +--- +date: '2015-05-18' +title: The best way to get Google Fonts offline +tags: [Misc] +layout: simple +attachments: + - local-google-fonts/skyfonts.png +description: Chances are you've downloaded a few Google fonts to your computer. Here's a better way to do it. +--- + +
+
+
+```
+
+[kramdown]: http://kramdown.gettalong.org/
+[@marksteve]: http://marksteve.com
+[documentation]: http://kramdown.gettalong.org/syntax.html#html-blocks
diff --git a/posts/2015/mocha-clean.md.disabled b/posts/2015/mocha-clean.md.disabled
new file mode 100644
index 00000000..db73702b
--- /dev/null
+++ b/posts/2015/mocha-clean.md.disabled
@@ -0,0 +1,50 @@
+---
+date: '2015-03-06'
+title: Cleaner Mocha stack traces
+tags: [JavaScript]
+description: Suppress stack trace frames from 3rd-party modules in Mocha.js.
+image: https://raw.githubusercontent.com/rstacruz/mocha-clean/gh-pages/comparison.png
+---
+
+[Mocha] is a great way to test JavaScript, but its stack traces are riddled
+with useless frames from Mocha internals and 3rd-party modules. Let's try and
+clean it up.
+
+I'm HTML
+
+ I am *Markdown text*. Be sure not to indent me,
+ else I'll be interpreted as a code block.
+
+
+
+
+
+