Rust 101: Loops

In the previous article, we discussed about Collections in rust. Now let’s dive into Loops.

TL;DR

• For loop
• Infinite For loop
• While loop

First, let’s start off by creating a new project called “Loops” using the following command

cargo new Loops --bin

For loop

For loop just like any other language runs a block of code a fixed number of times

Here is the syntax

for <iterating var> in <start index>..<end index>{
     //code block
}

Enumerate

Enumerate is a type of for loop which allows for two variables iteration. Enumerate is similar to the zip command in python.

Here is the syntax

for <iterating var> in (<start index>..<end index>).enumerate(){
   //code block
}

The output for the above program is

0,1
1,2
2,3
3,4
4,5
5,6
6,7
7,8
8,9

We can use this to iterate through collections. In this case the program outputs the index followed by the elements in a given array

The output for the above program is

0,1
1,2
2,3
3,4

Infinite For loop

Rust offers infinite loops rite out of the box.

Here is the syntax

loop{
     //code block
}

While Loop

While loop just like any other language runs a block of code a fixed number of times based on a condition

Here is the syntax

while <condition>{
    //Code block
}

Note:

Rust has no do-while loops

In the next article, we will discuss about Conditional statements.

link to the next article

Rust 101: Conditional Statements

Link to the previous article

Rust101: Collections