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Benjamin Feng fengb

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@fengb
fengb / svg.ts
Created June 29, 2017 14:36
ctx.body = svg.render({
width: 100,
height: 100,
elements: [
svg.polyline({
points: [{ x: 1, y: 2 }, { x: 5, y: 10 }],
presentation: { stroke: "red" }
}),
svg.path({
commands: [
@fengb
fengb / oldcontroller.rb
Created March 25, 2017 22:14
class UserController < ActionController::Base
def create
end
end
@fengb
fengb / postgres.md
Created March 9, 2016 21:54
Postgres: LEFT JOIN vs NOT IN vs NOT EXISTS

LEFT JOIN

$ EXPLAIN SELECT base.* FROM base LEFT JOIN relation ON relation.base_id = base.id WHERE relation.id IS NULL ORDER BY id LIMIT 1000;
                                            QUERY PLAN                           
---------------------------------------------------------------------------------------------------
 Limit  (cost=755508.94..755508.95 rows=1 width=54)                              
   ->  Sort  (cost=755508.94..755508.95 rows=1 width=54)                         
         Sort Key: base.id                                                       
         ->  Hash Left Join  (cost=44.65..755508.93 rows=1 width=54)             
               Hash Cond: (base.id = relation.base_id)
@fengb
fengb / new-hotness.js
Last active November 10, 2015 15:16
ES7 Ember hotness
export default class Route extends Ember.Route {
@Ember.observer('model.foo', 'model.bar')
@Ember.debounce(100)
rangeUpdater () {
let foo = this.get('model.foo')
let bar = this.get('model.bar')
this.trigger('rangeChange')
}
}
@fengb
fengb / gist:fc1cf780923890426c83
Last active August 29, 2015 14:20
KVO context hack
#define CLASS_KVO_CONTEXT ((__bridge void *)[self class])
[_quote addObserver:self forKeyPath:@"bid" options:0 context:CLASS_KVO_CONTEXT];
#define CLASS_KVO_CONTEXT(instance) ((__bridge void *)[instance class])
[_quote addObserver:self forKeyPath:@"bid" options:0 context:CLASS_KVO_CONTEXT(self)];
#define KVO_CONTEXT(instance) ((__bridge void *)[instance class])
[_quote addObserver:self forKeyPath:@"bid" options:0 context:KVO_CONTEXT([self class])];
@fengb
fengb / gist:60f2ee276cf27aeb768a
Created December 16, 2014 22:24
Verifying that +fengb is my openname (Bitcoin username). https://onename.io/fengb
@fengb
fengb / bundler dependency loop
Created January 11, 2013 21:27
Fetching gem metadata from http://rubygems.org/...........
Fetching gem metadata from http://rubygems.org/..
airbrake (3.1.6)
girl_friday (0.11.2)
connection_pool (1.0.0)
rubinius-actor (0.0.2)
rubinius-core-api (0.0.1)
builder (3.1.4)
mongoid (3.0.17)
origin (1.0.11)