Art  Lind

Art Lind

1598598120

Rust Adventures: Introduction to Collections — Vector

Hi there folks! Let’s continue our journey over Rust lands.

Today we are going to cover Collections. It is a central aspect of every programming language.

But what are collections?

In a previous article, we discussed the Rust ownership and variable values. Variables are memory locations where our values are stored. If you want to make a simple program to calculate the mean of a student’s notes.

Assuming that we have three students let’s code a little:

That seems to be OK, but what in the middle of the year a new student comes into class? We could always put one more variable, but the number of students can increase a lot and that will not be reasonable. If someone asks us to order the values? The problems sum up as we increase the demands for new features, so what now?

Collections to the rescue

Collections solve this problem by reserving a space in memory to put groups of values. Instead of creating one fixed variable for each student, we can create a group of students.

The basic structure Rust has to do that is Vector. So our program will change to create this structure.

If you want to create it with initial values use the vec! macro:

Or we could make it with initial zero value and add the values later. We need to declare it mutable.

Now to calculate the mean we could use the Iterator trait. It contains various methods to process values in a collection.

Now we can play with the values as much as we want without too much effort.

#software-development #programming #tech #rust #technology

What is GEEK

Buddha Community

Rust Adventures: Introduction to Collections — Vector
Joseph  Murray

Joseph Murray

1621559580

Collection vs Collections in Java: Difference Between Collection & Collections in Java

Introduction

This article will be looking into one of the most popular questions in Java Language – What is Collection in Java? Also, what do you mean by Collections in Java? Are Collection and Collections the same or different in Java?

What is Collection?

What is Collections?

Conclusion

#full stack development #collection #collection vs collections in java #collections in java #difference between collection and collections in java

Art  Lind

Art Lind

1598598120

Rust Adventures: Introduction to Collections — Vector

Hi there folks! Let’s continue our journey over Rust lands.

Today we are going to cover Collections. It is a central aspect of every programming language.

But what are collections?

In a previous article, we discussed the Rust ownership and variable values. Variables are memory locations where our values are stored. If you want to make a simple program to calculate the mean of a student’s notes.

Assuming that we have three students let’s code a little:

That seems to be OK, but what in the middle of the year a new student comes into class? We could always put one more variable, but the number of students can increase a lot and that will not be reasonable. If someone asks us to order the values? The problems sum up as we increase the demands for new features, so what now?

Collections to the rescue

Collections solve this problem by reserving a space in memory to put groups of values. Instead of creating one fixed variable for each student, we can create a group of students.

The basic structure Rust has to do that is Vector. So our program will change to create this structure.

If you want to create it with initial values use the vec! macro:

Or we could make it with initial zero value and add the values later. We need to declare it mutable.

Now to calculate the mean we could use the Iterator trait. It contains various methods to process values in a collection.

Now we can play with the values as much as we want without too much effort.

#software-development #programming #tech #rust #technology

Rust Lang Course For Beginner In 2021: Guessing Game

 What we learn in this chapter:
- Rust number types and their default
- First exposure to #Rust modules and the std::io module to read input from the terminal
- Rust Variable Shadowing
- Rust Loop keyword
- Rust if/else
- First exposure to #Rust match keyword

=== Content:
00:00 - Intro & Setup
02:11 - The Plan
03:04 - Variable Secret
04:03 - Number Types
05:45 - Mutability recap
06:22 - Ask the user
07:45 - First intro to module std::io
08:29 - Rust naming conventions
09:22 - Read user input io:stdin().read_line(&mut guess)
12:46 - Break & Understand
14:20 - Parse string to number
17:10 - Variable Shadowing
18:46 - If / Else - You Win, You Loose
19:28 - Loop
20:38 - Match
23:19 - Random with rand
26:35 - Run it all
27:09 - Conclusion and next episode

#rust 

Lydia  Kessler

Lydia Kessler

1626209220

ULTIMATE Rust Lang Tutorial! - Common Collections

The ultimate Rust lang tutorial. Follow along as we go through the Rust lang book chapter by chapter.

📝 Get notified when the Rust Cheatsheet comes out: https://letsgetrusty.com/cheatsheet

The Rust book: https://doc.rust-lang.org/stable/book/​

0:00 Intro
0:39 Vectors
10:19 Strings
18:30 Hashmaps
24:21 Outro

#letsgetrusty​ #rust​lang #tutorial

#rust #rust lang #common collections

Introduction to JAVA COLLECTIONS

In this blog we will understand basics of JAVA Collections framework.

What are JAVA Collections and Why do we need them?

The Collection in Java is a framework that provides an architecture to store and manipulate the group of objects.

Collections are like containers that group multiple items in a single unit. For example, a jar of chocolates, a list of names, etc. Collections are used in every programming language and when Java arrived, it also came with few. Let’s see how does it help us:

  • Reduces programming effort
  • Increases program speed and quality
  • Allows interoperability among unrelated APIs
  • Reduces effort to learn and to use new APIs
  • Reduces effort to design new APIs
  • Fosters software reuse

#functional programming #java #collections #functional java #java #introduction to java collections