javascript.md

Memory Management

http://polar.me/blog/2013/05/anaging-memory-in-javascript-is-hard

Profiling

Use the Timeline view in Chrome Developer Tools to debug memory leaks.

YouTube Video – mobile JS apps optimizations

• use advanced image compression like WebP or tools like ImageOptim
• use gzip, spdy, etc. on server side
• batch network calls to avoid mobile latency when radio turns off; also helps preserve battery
• reduce CSS render weight
• batch DOM manipulation
• use static memory usage patterns
  • preallocate objects, etc.

Tail Recursion

ECMA6 introduced an optimization for tail-call recursion where the last call in a function is purely a recursive call with no other operations. This optimization makes it possible for recursion to be performant by not growing the size of the call stack.

// Tail recursive
function recursive(a, b) {
  a = a + b;
  return recursive(a, b);
}

// Not tail recursive since 'a' must be kept in the call stack
function recursive(a) {
  return a + recursive(a, b);
}

Performance

Avoid delete https://groups.google.com/forum/#!msg/v8-users/zE4cOHBkAnY/HCWLAfmmChoJ