JavaScript is Syntactically a C Family Language

 

-It differs from C mainly in its type system which allows functions to be values
Identifiers

• Starts with a letter or _ or $
• Followed by zero or more letters, digits, _ or $
• Case Sensitibbe
• by convention, all bariables, parameters, membersm and function names start with lower case
• except for constructors which start with upper case
• intitial _ should be reserved for implementations
• @ should be reserved for machines (better to avoid)

Reserved Words

• abstract
• boolean break byte
• case catch char class const continue
• debugger default delete do double
• else enum export extends
• false final finally  float for function
• goto
• if implements import in instanceof int interfence
• long
• native new null
• package private protected public
• return
• short static super switch synchronized
• this throw throws transient true try typeof
• var volatile void
• while with

Comments

• //  line comment
• /* block comment */

Operators

• Arithmetic: +   –   *   /   %
• Comparison: ==    !-    <>    <=   >=
• Logical: &&   ||   !
• Bitwise:   $     |     ^    >>    >>>     <<
• Ternary:  ?: