02.Control_structures.slide

# Control Structures

## Blocks
    Go lets you declare variables in lots of places. You can declare them outside 
    of func‐ tions, as the parameters to functions, and as local variables within 
    functions.

    Each place where a declaration occurs is called a block.

## if

    The if statement in Go is much like the if statement in most programming languages.

.play -numbers -edit code/control_structures/if.go /^func main/,/^}/

    The most visible difference between if statements in Go and other languages is that 
    you don’t put parenthesis around the condition.

## if contd...

.play -numbers -edit code/control_structures/if2.go /^func main/,/^}/


## if contd(2)...

.play -numbers -edit code/control_structures/if3.go /^func main/,/^}/

## for
    In golang, only for loop exists for iterative traversal
    there are different use cases defined to use for loop

c style for loop

.play -numbers -edit code/control_structures/for.go /^func main/,/^}/

    Just like the if statement, there are no parenthesis around the parts of the for statement.
    var is not legal in for loop, only := is valid

## for contd...
The Condition-Only for Statement

.play -numbers -edit code/control_structures/for2.go /^func main/,/^}/

The Infinite for Statement

.play -numbers -edit code/control_structures/for3.go /^func main/,/^}/

    How do you get out of an infinite for loop without using the keyboard ? 


## break and continue
    That’s the job of the break statement.

.play -numbers -edit code/control_structures/for4.go /^func main/,/^}/

    Similaly continue is another flow control statement, Where as that'll be 
    used to skip the next condition execution and jump to for loop conditional check

## for contd(2)... for-range Statement
    The most used and important type. This can be applied to any ordered/unordered
    iterative data types(string, array, slice and maps).

.play -numbers -edit code/control_structures/for5.go /^func main/,/^}/

## switch

Expect few surprises, who hate switch in the other programming languages

.play -numbers -edit code/control_structures/switch.go /^func main/,/^}/

    - Missing break already, for individual case statements (no implicit fallthrough)
    - There is only one place, where we can use break inside switch i.e to break outer for loop

## Blank Switch
We can leave the switch conditional statement/expression as blank as in for loop

.play -numbers -edit code/control_structures/switch2.go /^func main/,/^}/