Golang - Donovan

Question 1

Variable Declaration

Answer 1

s := “” => only used in a function, cannot be used at the package level

var s string => initialized to zero value

var s = “” => rarely used, used when declaring multiple vars on same line

var s string = “” => explicity identifies the type of the var, important when its value is different then the zero val

:= is used for declaration

= is used for assignment

when using := at least one var on the left needs to be new or there will be compiler error

Question 2

For Loop

Answer 2

Basic Form

for initialization; condition; post{

}

Like a While loop

for condition {

}

Like a inifinite loop

for {

}

With a range operator
ass := [1, 2, 3]

for index, val := range arr{

}

Question 3

Command Line Args

Answer 3

package = os

• os.Args provides all the command line args
• os.Args[0] is the command itself
• os.Args[1:] => gives list of all the args (so escapes the first arg)

for index, val := range os.Args[1:]{

fmt.Println(index, val)

}

Question 4

Declarations in Go

Answer 4

• there are four types of declarations
  1. var
  2. const
  3. type
  4. func

Question 5

Files in Go

Answer 5

package declaration

imports

package leve declarations

funciton level declarations

Question 6

Variable