Reading-Notes

My journal for Code Fellows

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Programming with JavaScript Lab 07

Control Flow

• Control flow is the order in which your computer executes statements in a script
• Scripts use condition structures such as
  • Loops
  • Function
  • Events

JavaScript Function

• A function is a block of code designed to perform a particular task
• It executes whe something invokes/calls it
• It is defined by a function keyword followed by ()
• Inside the parentheses may be parameters
• The code to be executed is placed inside curly brackets following the parentheses
• Function can be called three different ways
  • When an event occurs (user action)
  • When it is called in the code
  • When it is set to be self invoked
• Function return will return whatever value the code executes back to the statement
• You can define the code once and use it multiple times
• Variable declared within a function are Local Variables and can only be referenced within the function

JavaScript Operators

Arithmetic Operators

+ Addition
- Subtraction
* Multiplication
** Exponentiation (ES2016)
/ Division
% Modulus (Division Remainder)
++ Increment
-- Decrement

Assignment Operators

=	x = y	x = y
+=	x += y	x = x + y
-=	x -= y	x = x - y
*=	x *= y	x = x * y
/=	x /= y	x = x / y
%=	x %= y	x = x % y
**=	x **= y	x = x ** y

Comparison Operators

== equal to
=== equal value and equal type
!= not equal
!== not equal value or not equal type
> greater than
< less than
>= greater than or equal to
<= less than or equal to
? ternary operator

Logical Operators

&& logical and
|| logical or
! logical not

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