Category	Feature/Keyword
Array Handling	Array join, length, reverse, sort
Assignments	Assign (=) Compound Assign (OP=)
Booleans	Boolean
Comments	/*...*/ or //
Constants/Literals	NaN null true, false Infinity undefined
Control flow	break continue for for...in if...else return while
Dates and Time	Date getDate, getDay, getFullYear, getHours, getMilliseconds, getMinutes, getMonth, getSeconds, getTime, getTimezoneOffset, getYear, getUTCDate, getUTCDay, getUTCFullYear, getUTCHours, getUTCMilliseconds, getUTCMinutes, getUTCMonth, getUTCSeconds, setDate, setFullYear, setHours, setMilliseconds, setMinutes, setMonth, setSeconds, setTime, setYear, setUTCDate, setUTCFullYear, setUTCHours, setUTCMilliseconds, setUTCMinutes, setUTCMonth, setUTCSeconds, toGMTString, toLocaleString, toUTCString, parse, UTC
Declarations	function new this var with
Function Creation	Function arguments, length
Global Methods	Global escape, unescape eval isFinite, isNaN parseInt, parseFloat
Math	Math abs, acos, asin, atan, atan2, ceil, cos, exp, floor, log, max, min, pow, random, round, sin, sqrt, tan, E, LN2, LN10, LOG2E, LOG10E, PI, SQRT1_2, SQRT2
Numbers	Number MAX_VALUE, MIN_VALUE NaN NEGATIVE_INFINITY, POSITIVE_INFINITY
Object Creation	Object new constructor, prototype, toString, valueOf
Operators	Addition (+), Subtraction (-) Modulus arithmetic (%) Multiplication (*), Division (/) Negation (-) Equality (==), Inequality (!=) Less Than (<), Less Than or Equal To (<=) Greater Than (>) Greater Than or Equal To (>=) Logical And(&&), Or (||), Not (!) Bitwise And (&), Or (|), Not (~), Xor (^) Bitwise Left Shift (<<), Shift Right (>>) Unsigned Shift Right (>>>) Conditional (?:) Comma (,) delete, typeof, void Decrement (--), Increment (++)
Objects	Array Boolean Date Function Global Math Number Object String
Strings	String charAt, charCodeAt, fromCharCode indexOf, lastIndexOf split toLowerCase, toUpperCase length