01_05_switch.slide

# switch


## switch

syntax:

    switch{
    case condition1:
        // do stuff
    }

example: 

.play -numbers _concepts/01_introduction/05switch/01switch.go /^func main/,/^}/


## switch: default

syntax:

    switch{
    case condition1:
        // do stuff
    default: 
        // do stuff
    }

example: 

.play -numbers _concepts/01_introduction/05switch/02default.go /^func main/,/^}/


## switch: alternative to if-else ladder

simplifies long if-else ladder

example: if else ladder

.play -numbers _concepts/01_introduction/05switch/03a_ifelse_ladder.go /^func main/,/^}/

## switch: alternative to if-else ladder

example: simplified with switch

.play -numbers _concepts/01_introduction/05switch/03b_switch.go /^func main/,/^}/



## switch: constant case expression
lets take another example

.play -numbers _concepts/01_introduction/05switch/04a_constant_case.go /^func main/,/^}/

: note: all the operations here are equals with color variable on the left side. 
: .
: such operations can be simplified to.... (next slide)

## switch: constant case expression

that can be simplified as below

.play -numbers _concepts/01_introduction/05switch/04b_constant_case.go /^func main/,/^}/




## fallthrough
executes the next block without checking the condition

: unlike some programming languages, switch in Go doesn't fall through by default. we have to explicitly use the fallthrough keyword.

TODO: add fallthrough example

## break

TODO: need to understand if break can be used with switch without a for loop. and also need to understand why break is associated with a switch, rather than the for loop.


## type switch

_covered in later slides with interfaces_