Hello world

Title description Strings A sequence of characters, such as letters, numbers, and symbols. The string data type is a sequence of characters, such as letters, numbers, and symbols. It's the data type for storing most text-based information.Declare stringsTo declare a string variable, put quotes around the characters. It's more common to use double quotes ("), but single quotes (') also work. If you want to include a single or double quote in your string, wrap your string around the other type of quote, or use an escaped quote. Hello world!local string2 = 'Hello "world"!'print(string2) --> Hello "world"!">local string1 = "Hello world!"print(string1) --> Hello world!local string2 = 'Hello "world"!'print(string2) --> Hello "world"!To include both single and double quotes in a string, or to create multi-line strings, declare them using double brackets: Hello--> world!--> Hello "world"!--> Hello 'world'!">local string1 = [[Helloworld!Hello "world"!Hello 'world'!]]print(string1)--> Hello--> world!--> Hello "world"!--> Hello 'world'!If necessary, you can nest multiple brackets inside a string using the same number of equal signs in both the beginning and ending bracket: Hello--> [[world!]]">local string1 = [=[Hello[[world!]]]=]print(string1)--> Hello--> [[world!]]Combine stringsTo combine strings, concatenate them with two dots (..). Concatenating strings doesn't insert a space between them, so you'll need to include space(s) at the end/beginning of a preceding/subsequent string, or concatenate a space between the two strings. Helloworld!print(string2) --> Hello world!print(string3) --> Hello world!">local hello = "Hello"local helloWithSpace = "Hello "local world = "world!"local string1 = hello .. worldlocal string2 = helloWithSpace .. worldlocal string3 = hello .. " " .. worldprint(string1) --> Helloworld!print(string2) --> Hello world!print(string3) --> Hello world!Note that the print() command takes multiple arguments and combines them with spaces, so you can use , instead of .. to yield spaces in print() outputs. Helloworld!print(hello, world .. exclamationMark) --> Hello world!print(hello, world, exclamationMark) --> Hello world !">local hello = "Hello"local world = "world"local exclamationMark = "!"print(hello .. world .. exclamationMark) --> Helloworld!print(hello, world .. exclamationMark) --> Hello world!print(hello, world, exclamationMark) --> Hello world !Convert stringsTo convert a string to a number, use the Global.LuaGlobals.tonumber() function. If the string doesn't have a number representation, Global.LuaGlobals.tonumber() returns nil. 123local alphanumericString = "Hello123"print(tonumber(alphanumericString)) --> nil">local numericString = "123"print(tonumber(numericString)) --> 123local alphanumericString = "Hello123"print(tonumber(alphanumericString)) --> nilEscape stringsTo escape a double- or single-quote string declaration and embed almost any character, put a backslash (\) before the character. For example:To embed a single quote in a single-quote string, use '.To embed a double quote in a

Double-quote string, use ". Hello 'world'!local string2 = "Hello "world"!"print(string2) --> Hello "world"!">local string1 = 'Hello 'world'!'print(string1) --> Hello 'world'!local string2 = "Hello "world"!"print(string2) --> Hello "world"!Certain characters following backslashes produce special characters rather than escaped characters:To embed a new line, use \n.To embed a horizontal tab, use \t. Hello--> world!local string2 = "Hello\tworld!"print(string2) --> Hello world!">local string1 = "Hello\nworld!"print(string1)--> Hello--> world!local string2 = "Hello\tworld!"print(string2) --> Hello world!String interpolationLuau supports string interpolation, a feature that lets you insert expressions into strings. Use backticks (`) to declare an interpolated string, then add expressions inside of curly brackets: Hello world!">local world = "world"local string1 = `Hello {world}!`print(string1) --> Hello world!Although variables are the most common usage, you can use any expression, including math: Hello world, 1 time!print(string2) --> Hello world, 2 times!print(string3) --> Hello world a third time!">local world = "world"local number = 1local letters = {"w", "o", "r", "l", "d"}local string1 = `Hello {world}, {number} time!`local string2 = `Hello {world}, {number + 1} times!`local string3 = `Hello {table.concat(letters)} a third time!`print(string1) --> Hello world, 1 time!print(string2) --> Hello world, 2 times!print(string3) --> Hello world a third time!Standard escape rules apply for backticks, curly brackets, and backslashes: Hello `{world}`!">local string1 = `Hello \`\{world\}\`!`print(string1) --> Hello `{world}`!Math conversionIf you perform math operations on a string, Luau automatically converts the string to a number. If the string doesn't have a number representation, it throws an error. 65print("55" - 10) --> 45print("55" * 10) --> 550print("55" / 10) --> 5.5print("55" % 10) --> 5print("Hello" + 10) --> print("Hello" + 10):1: attempt to perform arithmetic (add) on string and number">print("55" + 10) --> 65print("55" - 10) --> 45print("55" * 10) --> 550print("55" / 10) --> 5.5print("55" % 10) --> 5print("Hello" + 10) --> print("Hello" + 10):1: attempt to perform arithmetic (add) on string and numberComparisonsStrings can be compared using the , , > and >= operators which compare using lexicographical order based on the ASCII codes of each character in a string.This will result in numbers in strings not being compared correctly, for example, "100" will be less than "20", since the bytes "0" and "1" have lower ASCII codes than byte "2". trueprint("Banana" true (B is before a in ASCII)print("number100" true">print("Apple" "apple") --> trueprint("Banana" "apple") --> true (B is before a in ASCII)print("number100" "number20") --> trueString pattern referenceA string pattern is a combination of characters that you can use withLibrary.string.match(), Library.string.gmatch(), and other functions tofind

Creates a root directory as the working directory. However, if your build has several steps, earlier steps can share artifacts with later steps by specifying the same working directory.c:\workspace in Windows or /workspace in LinuxvolumeMountThe volumeMount object has the following properties.PropertyTypeOptionalDescriptionDefault valuenamestringNoThe name of the volume to mount. Must exactly match the name from a volumes property.NonemountPathstringnoThe absolute path to mount files in the container.NoneExamples: Task step propertiesExample: idBuild two images, instancing a functional test image. Each step is identified by a unique id which other steps in the task reference in their when property.az acr run -f when-parallel-dependent.yaml v1.1.0steps: # build website and func-test images, concurrently - id: build-hello-world build: -t $Registry/hello-world:$ID -f hello-world.dockerfile . when: ["-"] - id: build-hello-world-test build: -t hello-world-test -f hello-world.dockerfile . when: ["-"] # run built images to be tested - id: hello-world cmd: $Registry/hello-world:$ID when: ["build-hello-world"] - id: func-tests cmd: hello-world-test env: - TEST_TARGET_URL=hello-world when: ["hello-world"] # push hello-world if func-tests are successful - push: ["$Registry/hello-world:$ID"] when: ["func-tests"]Example: whenThe when property specifies a step's dependency on other steps within the task. It supports two parameter values:when: ["-"] - Indicates no dependency on other steps. A step specifying when: ["-"] will begin execution immediately, and enables concurrent step execution.when: ["id1", "id2"] - Indicates the step is dependent upon steps with id "id1" and id "id2". This step won't be executed until both "id1" and "id2" steps complete.If when isn't specified in a step, that step is dependent on completion of the previous step in the acr-task.yaml file.Sequential step execution without when:az acr run -f when-sequential-default.yaml v1.1.0steps: - cmd: bash echo one - cmd: bash echo two - cmd: bash echo threeSequential step execution with when:az acr run -f when-sequential-id.yaml v1.1.0steps: - id: step1 cmd: bash echo one - id: step2 cmd: bash echo two when: ["step1"] - id: step3 cmd: bash echo three when: ["step2"]Parallel images build:az acr run -f when-parallel.yaml v1.1.0steps: # build website and func-test images, concurrently - id: build-hello-world build: -t $Registry/hello-world:$ID -f hello-world.dockerfile . when: ["-"] - id: build-hello-world-test build: -t hello-world-test -f hello-world.dockerfile . when: ["-"]Parallel image build and

String.fn main() { let mut s = String::from("ello"); s.insert(0, 'H'); // inserts "H" at the beginning println!("{}", s); // "Hello" s.remove(0); // removes the first character println!("{}", s); // "ello"}Removing whitespaces from the beginning of a stringThe .trim method helps with removing whitespaces from the beginning and end of a string. Here is an example:fn main() { let s = String::from(" hello world "); println!("{}", s.trim()); // "hello world"}Convert a string to upper case and lower caseUse the .to_lowercase method to convert a string to lower case letters and the .to_uppercase to make the conversions.fn main() { let s = String::from("HELLO"); println!("{}", s.to_lowercase()); // "hello" let t = String::from("hello"); println!("{}", t.to_uppercase()); // "HELLO"}Splitting a string into substrings We can use the .split() method to split a string into parts and join them back together using the .join() method. Here is an example:fn main() { let s = "hello,world,rust"; let substrings: Vec&str> = s.split(",").collect(); // splits into substrings println!("{:?}", substrings); // ["hello", "world", "rust"] let joined = substrings.join(","); // joins substrings back together println!("{}", joined); // "hello,world,rust"}Check a substring exists in a stringWe can use the .contains to check if a string contains a specific substring. Use the .starts_with() to check that a string starts with a specific substring. And also use the ends_with() to check that a string ends with a specific substring.fn main() { let s = "hello, world"; if s.contains("world") { // checks if "world" is in the string println!("'world' is in the string"); } if s.starts_with("hello") { // checks if the string starts with "hello" println!("the string starts with 'hello'"); } if s.ends_with("world") { // checks if the string ends with "world" println!("the string ends with 'world'"); }}Replacing a stringThe .replace method is used to replace a string with another stringfn main() { let s = String::from("hello world"); println!("{}", s.replace("world", "rust")); // "hello rust"}ConclusionRust’s string manipulation capabilities might seem tricky at first due to the distinction between String and &str, but with practice, they offer powerful and flexible tools for working with textHappy hacking

And methods. Using base classes reduce code redundancy in apps and are useful when supplying base code from class libraries to multiple apps. For more information, see Inheritance in C# and .NET.In the following example, the BlazorRocksBase1 base class derives from ComponentBase.BlazorRocks1.razor:@page "/blazor-rocks-1"@inherits BlazorRocksBase1Blazor Rocks!Blazor Rocks! Example 1 @BlazorRocksText@page "/blazor-rocks-1"@inherits BlazorRocksBase1Blazor Rocks!Blazor Rocks! Example 1 @BlazorRocksText@page "/blazor-rocks-1"@inherits BlazorRocksBase1Blazor Rocks!Blazor Rocks! Example 1 @BlazorRocksText@page "/blazor-rocks-1"@inherits BlazorRocksBase1Blazor Rocks!Blazor Rocks! Example 1 @BlazorRocksText@page "/blazor-rocks-1"@inherits BlazorRocksBase1Blazor Rocks! Example 1 @BlazorRocksText@page "/blazor-rocks-1"@inherits BlazorRocksBase1Blazor Rocks! Example 1 @BlazorRocksTextBlazorRocksBase1.cs:using Microsoft.AspNetCore.Components;namespace BlazorSample;public class BlazorRocksBase1 : ComponentBase{ public string BlazorRocksText { get; set; } = "Blazor rocks the browser!";}using Microsoft.AspNetCore.Components;namespace BlazorSample;public class BlazorRocksBase1 : ComponentBase{ public string BlazorRocksText { get; set; } = "Blazor rocks the browser!";}using Microsoft.AspNetCore.Components;namespace BlazorSample;public class BlazorRocksBase1 : ComponentBase{ public string BlazorRocksText { get; set; } = "Blazor rocks the browser!";}using Microsoft.AspNetCore.Components;namespace BlazorSample;public class BlazorRocksBase1 : ComponentBase{ public string BlazorRocksText { get; set; } = "Blazor rocks the browser!";}using Microsoft.AspNetCore.Components;namespace BlazorSample;public class BlazorRocksBase1 : ComponentBase{ public string BlazorRocksText { get; set; } = "Blazor rocks the browser!";}using Microsoft.AspNetCore.Components;namespace BlazorSample;public class BlazorRocksBase1 : ComponentBase{ public string BlazorRocksText { get; set; } = "Blazor rocks the browser!";}RoutingRouting in Blazor is achieved by providing a route template to each accessible component in the app with an @page directive. When a Razor file with an @page directive is compiled, the generated class is given a RouteAttribute specifying the route template. At runtime, the router searches for component classes with a RouteAttribute and renders whichever component has a route template that matches the requested URL.The following HelloWorld component uses a route template of /hello-world, and the rendered webpage for the component is reached at the relative URL /hello-world.HelloWorld.razor:@page "/hello-world"Hello World!Hello World!@page "/hello-world"Hello World!Hello World!@page "/hello-world"Hello World!@page "/hello-world"Hello World!@page "/hello-world"Hello World!@page "/hello-world"Hello World!The preceding component loads in the browser at /hello-world regardless of whether or not you add the component to the app's UI navigation. Optionally, components can be added to the NavMenu component so that a link to the component appears in the app's UI-based navigation.For the preceding HelloWorld component, you can add a NavLink component to the NavMenu component.