ar5had

JS First

About This Manifesto

Have you ever argued for or against teaching language X as the first language in a university computer science curriculum? If so, I hope that your arguments:

• were first and foremost about students, not about your personal language preferences (in other words, you should answer the question “What do we want students to gain from their experience with a first language?”, not “Is language X better than language Y?” because people hate that latter question);
• kept in mind that ultimately we want to train polyglots, so the first language is never the only language; and
• took into account previous work from computing educators, and education theorists and practitioners in general.

ar5had

ּ_בּ
בּ_בּ
טּ_טּ
כּ‗כּ
לּ_לּ
מּ_מּ
סּ_סּ
תּ_תּ
٩(×̯×)۶
٩(̾●̮̮̃̾•̃̾)۶

ar5had

// state = { len: 2, arr: [1,2] };

const newState = Object.assign({}, state);

// for simplicity sake
newState.arr = [3, 4];

this.setState({state: newState});

// or

ar5had

<svg version="1.1" width="184px" height="166px" viewBox="0 0 184 166">
  <g transform="translate(92 83)">
    <circle fill="#222" r="16" />
    <g fill="none" stroke="#222" stroke-width="8">
      <ellipse rx="84" ry="32" />
      <ellipse rx="84" ry="32" transform="rotate(120)" />
      <ellipse rx="84" ry="32" transform="rotate(60)" />
    </g>
  </g>
</svg>

ar5had

arshad@asd:~/Documents/gr/comm-central$ ./mozilla/mach build
 0:01.21 /usr/bin/make -f client.mk -s
 0:01.55 Adding client.mk options from /home/arshad/Documents/gr/comm-central/mozconfig:
 0:01.55     FOUND_MOZCONFIG := /home/arshad/Documents/gr/comm-central/mozconfig
 0:10.53 make[2]: Circular /home/arshad/Documents/gr/comm-central/mozilla/CLOBBER <- /home/arshad/Documents/gr/comm-central/mozilla/CLOBBER dependency dropped.
 0:10.59 make[3]: Circular /home/arshad/Documents/gr/comm-central/mozilla/CLOBBER <- /home/arshad/Documents/gr/comm-central/mozilla/CLOBBER dependency dropped.
 0:10.76 Elapsed: 0.00s; From dist/public: Kept 0 existing; Added/updated 0; Removed 0 files and 0 directories.
 0:10.78 Elapsed: 0.02s; From dist/private: Kept 0 existing; Added/updated 0; Removed 0 files and 0 directories.
 0:10.97 Elapsed: 0.10s; From dist/xpi-stage: Kept 15 existing; Added/updated 0; Removed 2 files and 0 directories.
 0:21.03 Elapsed: 10.28s; From dist/idl: Kept 1333 existing; Added/updated 0; Removed 0 files

ar5had

function isNull(v) {
  return typeof v === "object" && !v;
}

function isPrimitive(v) {
  return ["number", "string", "boolean", "undefined"].indexOf(typeof v) !== -1 || isNull(v);
}

function isPlainObject(o) {
  return o && typeof o === "object" && o.constructor === Object;

ar5had

Keybase proof

I hereby claim:

• I am arshdkhn1 on github.
• I am arshdkhn1 (https://keybase.io/arshdkhn1) on keybase.
• I have a public key ASBWaziczjSQHUbAQzWKWrLU1er2gvrX45TAYHZ2ye9ZUAo

To claim this, I am signing this object:

ar5had

// mongoose 4.3.x
var mongoose = require('mongoose');
 
/* 
 * Mongoose by default sets the auto_reconnect option to true.
 * We recommend setting socket options at both the server and replica set level.
 * We recommend a 30 second connection timeout because it allows for 
 * plenty of time in most operating environments.
 */
var options = { server: { socketOptions: { keepAlive: 300000, connectTimeoutMS: 30000 } }, 

ar5had

Parens And Performance

Years ago, some smart folks that worked on JS engines realized that not all JS that's loaded into a page/app initially is needed right away. They implemented JIT to optimize this situation.

JIT means Just-In-Time, which means essentially that the engine can defer processing (parsing, compiling) certain parts of a JS program until a later time, for example when the function in question is actually needed. This deferral means the engine is freer to spend the important cycles right now on the code that's going to run right now. This is a really good thing for JS performance.

Some time later, some JS engine devs realized that they needed to get some hints from the code as to which functions would run right away, and which ones wouldn't. In technical speak, these hints are called heuristics.

So they realized that one very common pattern for knowing that a function was going to run right away is if the first character before the function keyword was a (, because that usually m

ar5had

Hex Opacity Values

100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6