“Javascript: the Good Parts”: the Good Parts

Use JSLint to determine if what you are doing is sensible.
Avoid “/* … */” for comments, “*/” appears in useful constructs in javascript. Use “//”.
Javascript strings are 16-bit unicode. It has no character type, only string.
All numbers are numeric, there is no int/float/etc.
The value Infinity represents all values greater than ~1.79E+308
Javascript has functional scoping. Braces do not denote scope. Thus, declare variables at the top of functions not within braces.
Falsy values: false, null, undefined, ” (empty string), 0, NaN. Everything else is truthy.
If using a for ... in loop you must you hasOwnProperty.
typeof returns "object" for an array and for null.
Declare var that = this; in a function so that inner functions can access that function’s this value. (Prefer “self”?)
Because functions are first class objects, javascript supports currying.
General memoizer (p. 45)
Don’t use new at all.
Functional inheritance (p. 52).
Do not use “/g” with RegExp.test.
Prefer “if (” to “if(” because “if(” looks like a method invocation.
K&R-style curly braces because of how return works in javascript.
Always pass the second parameter (radix) to parseInt.
Always use === and !== not == and !=.
Do not use with.
Use JSON.parse not eval.
Do not use ++ and --.