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API Development in Go Using MongoDB

Conditional Statements and Loops

Learn how to make decisions and repetitions in Go.

We'll cover the following...

Conditional statements

Conditional statements perform various actions based on specific conditions. The developer specifies one or more conditions that the program executes. Particular statements are returned based on the outcome. Go uses logical and comparison operators to create conditions for different decisions. We’re going to explore the following:

  • The if statement
  • The if else statement
  • The else if statement
  • The nested if statement
  • The switch statement

The if statement

The if statement executes a code block only if the specified condition is true.

Go (1.16.5)
package main

import ("fmt")



func main() {

  bicycles:= 9

  tricycles:= 3

  Username := "Greghu"

  if bicycles > tricycles {

    fmt.Println("We have more bicycles than tricycles")

  }

  if Username == "Lizzy" {

    fmt.Println("Elizabeth's username is Lizzy")

  }

  // This condition will not print out a result, because it is not true.

}

The if else statement

The if else statement allows us to run one block of code if the specified condition is true and another block of code if it’s false.

Go (1.16.5)
package main

import ("fmt")



func main() {



  Username := "Greghu"

  if Username == "Lizzy" {

    fmt.Println("Elizabeth's username is Lizzy")

  } else {

    fmt.Println("Greg's username is", Username)

  }

  // Remember starting our else statement on a different line would raise an error.

}

The else if statement

The else if statement allows us to combine multiple if else statements.

Go (1.16.5)
package main

import ("fmt")



func main() {



  Username := "Greghu"

  if Username == "Lizzy" {

    fmt.Println("Elizabeth's username is Lizzy")

  } else if Username == "Greghu"  {

    fmt.Println("Greg's username is", Username)

  } else {

    fmt.Println("Ooops, please sign up!")

  }

}

The nested if

The nested if statement is an if statement within another if statement.

Go (1.16.5)
package main

import ("fmt")

func main() {

  number := 7

  if number <= 9 {

    fmt.Println(number, "is less than 9.")

    if number < 11 {

      fmt.Println(number, "is also less than 11.")

     }

  } else {

    fmt.Println(number, "is greater than 9 and 11.")

  }

}

Here’s what’s happening in the code above:

  • The first if ...