My notes from Douglas Crockford's speech "JavaScript Programming Style & Your Brain"

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Douglas Crockford
Sr. JavaScript Architect, Yahoo!

JavaScript Programming Style & Your Brain

He made JSLint

Prefer forms that are error resistant and more reliable
	return
	{
		something;
	}
	
	^ this is an error in JavaScript; put your curly braces on the same line ALWAYS

	switch statements (fallthrough hazard)

"That hardly ever happens" == "It happens"

Good use of style can help reduce the occurrence of errors.
	For English: William Strunk - The Elements of Style
	
	Programs must communicate clearly to people.
		Use elements of good composition where applicable.

Use spaces to disambiguate:
	No space before ( when used to invoke a function
	No space between a function name and parameter list
	One space between all other names and (

Avoid the JavaScript 'with' statement because it has ambiguous situations.

Always use ===, never ==; it doesn't do type conversion.

Multiline string literals are bad, they break indentation and have a syntax error if there's a space after the backslash

if (a = b) {...}
^ the reader will almost always assume this is a bug; if you meant to assign b to a and then test a, then write that (in two lines).

Scope - block scope vs function scope.
	JavaScript has function scope
	
	Declare all variables at the top of the function (not top of if/for/other block).
	Declare all functions before you call them.

	for(var i ...) - i is not scoped to the loop

Avoid ++, use += 1
	Only one more character
	In javascript, x++ is actually ++x
	Multiple ++'s consecutively look like an error

var a = b = 0;
	Makes a global variable b, sets it to 0, and sets a to value of b.
	NOT the same as `var a=0, b=0;`

Write in a way that clearly communicates your intent.

Always put curly braces on if statements.

As our processes become more agile, our coding must be more resilient [to bugs].

Language subsetting.
	Only a madman would use all of C++.

Good style is good for your gut.

That's useful note,Thanks:)