Общяя информация:
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import React from 'react' | |
export default class extends React.Component { | |
constructor () { | |
super() | |
this.state = { components: undefined } | |
this.markers = new WeakMap() | |
} | |
componentDidMount () { |
FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
- By Edmond Lau
- Highly Recommended 👍
- http://www.theeffectiveengineer.com/
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/* | |
Demo: https://jsfiddle.net/elky/f6khaf2t/ | |
<div class="element"> | |
<div class="truncate"> | |
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt | |
ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco | |
laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in | |
voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat | |
non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. |
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
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# "Understanding Python's closures". | |
# | |
# Tested in Python 3.1.2 | |
# | |
# General points: | |
# | |
# 1. Closured lexical environments are stored | |
# in the property __closure__ of a function | |
# | |
# 2. If a function does not use free variables |