This is the slide stack to accompany the YouTube video of the same name at http://youtu.be/OKbh3SMUALc

1. JavaScript
Comments and
Conditionals
Charles Russell
Bennu Bird Media

2. Note Taking
●
Detectives journal
●
Fire Log
●
Sketch books
●
In programs we use comments

3. Comments are for people
not machines
●
Notes to others and ourselves describing our
thinking.
●
Often used to outline the program with pseudo
code.
●
Establish proprietary information like authorship
copyright and other
●
Documentation

4. Comments in JavaScript
●
Single line comment //
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From where the comment begins to end of line
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Multi-line comment /* */
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Begins with /* and continues to be ignored no matter
how many lines until */
●
Documentation comment /** */
●
Used by documentation tools like Scriptdoc or
Doxygen to document code in the code document and
extract to either a sepeate document of web page.

5. Branching out
●
It is very common to want to decide one of two
paths for a program to take
●
Statements that choose between multiple courses of
action are called conditional statemens
●
If statements provide that branch
●
if (condition ) doSomething() else doSomethingElse()
if (boolean) {
statement1;
statement2;
}else{

6. Multibranch Selection
●
If great for when you have only two possible paths
●
What if you have many paths
●
else if to the rescue
if (condition) {
doSomething
} else if ( condition) {
doAnotherThing
} else{
doSomethingElse

7. Switch JavaScript's
Manifold
●
Switch is another way to branch into one of many
paths
●
Two other keywords needed for this statement
– case: this is the conditional
– break Breaks out of the switch
●
Optional default keyword
– This part of the switch is executed if no other condition is
met

8. Switch the syntax
switch (a) {
case value:
statements
break;
case value2:
statements
break;
default:
statements

9. Summary
●
Comments allow to keep notes and document
your code
●
There are single line and multiline comment types
●
A special multiline comment can aid in documentation
●
Conditional statements allow branching to alter
operational flow.
●
{ } define code blocks (and somethings we will get to
soon)
●
If ( conditional expression) {..}else if {..} else{..}
– Else optional
●
Switch is used for selecting from multiple code blocks

10. Next: Iterations