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    Home»Tech»DAML Cheat Sheet: A Quick Guide to the Programming Language will code
    DAML Cheat Sheet
    DAML Cheat Sheet

    DAML Cheat Sheet: A Quick Guide to the Programming Language will code

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    By Admin on February 24, 2023 Tech
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    DAML is a smart contract language developed by Digital Asset that is designed to simplify the process of creating and managing complex financial agreements. It is an open-source language that uses a functional programming paradigm and is built on top of Haskell. While DAML Cheat Sheet is relatively easy to learn, it can still be challenging for beginners to remember all of the syntax and semantics of the language. That’s where a DAML cheat sheet comes in handy.

    In this article, we’ll provide a comprehensive DAML cheat sheet to help you quickly reference the most important concepts and syntax of the language.

    Table of Contents

    • Data Types and Declarations of DAML Cheat Sheet
    • Variable Declaration
    • Functions
    • Conditional Statements
    • Loops
    • Lists
    • Maps
    • Templates
    • Contracts
    • Commands
    • Conclusion

    Data Types and Declarations of DAML Cheat Sheet

    DAML is a statically-typed language, which means that variables must be declared with their data type before they can be used. The following data types are supported in DAML:

    • Int: an integer value
    • Text: a string of characters
    • Bool: a Boolean value (true or false)
    • Decimal: a fixed-point decimal value
    • Party: a participant in a DAML contract (e.g., a person or organization)
    • Time: a timestamp
    • List: a list of values of the same data type
    • Map: a mapping between keys and values of different data types

    Variable Declaration

    To declare a variable in DAML Cheat Sheet, you must specify its data type, followed by its name. For example:

    VBnet
    let x: Int = 42
    let y: Text = "Hello, world!"
    let z: Bool = true

    You can also declare multiple variables of the same type on the same line, separated by commas:

    CSS
    let a, b, c: Int = 1, 2, 3

    Functions

    In DAML, functions are first-class citizens, which means that they can be passed as arguments to other functions and returned as values. To define a function in DAML Cheat Sheet, use the daml keyword, followed by the function name, its arguments, and its return type. For example:

    SQL
    daml add(x: Int, y: Int): Int = x + y

    This function takes two integer arguments (x and y) and returns their sum.

    Conditional Statements

    Conditional statements in DAML Cheat Sheet are similar to those in other programming languages. To perform a conditional check, use the if keyword, followed by the condition in parentheses. For example:

    Python
    if x > y then "x is greater than y" else "y is greater than or equal to x"

    Loops

    DAML supports several types of loops, including for loops and while loops. The syntax for these loops is similar to that of other programming languages. For example:

    Java
    for i in 1..10 do
      -- do something with i
    
    while x > 0 do
      -- do something with x

    Lists

    Lists are a commonly used data structure in DAML. To create a list, use square brackets ([]) and separate the elements with commas. For example:

    Java
    let lst: List Int = [1, 2, 3, 4, 5]

    You can also append elements to a list using the ++ operator:

    Java
    let lst2: List Int = lst ++ [6, 7, 8, 9, 10]

    Maps

    Maps are another commonly used data structure in DAML. To create a map, use curly braces ({}) and separate the key-value pairs with commas. For example:

    Java
    let map: Map Text Int = {"one": 1, "two": 2, "three": 3}

    You can access and modify map values using the following syntax:

    let val1 = map["one"]
    let map2 = map with ["one" <- 4]

    The first line retrieves the value associated with the key "one" from the map variable. The second line creates a new map called map2 that has the value associated with the key "one" replaced with the value 4.

    Templates

    Templates are the building blocks of DAML contracts. They define the data structure and behavior of a contract. To create a new template, use the template keyword, followed by the template name and its fields. For example:

    template Token
      with
        owner: Party
        symbol: Text
        quantity: Int
      where
        signatory owner
        ensure quantity > 0

    This template defines a new token contract that has an owner, a symbol, and a quantity field. The signatory keyword specifies that the owner of the contract is also the party that is authorized to sign it. The ensure keyword specifies that the quantity of tokens must be greater than 0.

    Contracts

    Contracts in DAML represent agreements between parties. They are created from templates and are updated through a series of commands. To create a new contract, use the create keyword, followed by the name of the template and its fields. For example:

    SQL
    create Token with owner = Alice, symbol = "ABC", quantity = 100

    This command creates a new Token contract with Alice as the owner, the symbol "ABC", and a quantity of 100.

    Commands

    Commands in DAML are used to update the state of contracts. They can be used to create, archive, or exercise contracts. To execute a command, use the submit keyword, followed by the command. For example:

    submit create Token with owner = Alice, symbol = "ABC", quantity = 100

    This command creates a new Token contract with Alice as the owner, the symbol "ABC", and a quantity of 100.

    Conclusion

    DAML is a powerful and flexible programming language that is specifically designed for creating and managing complex financial contracts. While it can be challenging to learn, a DAML cheat sheet can be an invaluable resource for both beginners and experienced developers.

    The cheat sheet provided in this article covers the most important concepts and syntax of the language, including data types, functions, conditional statements, loops, lists, maps, templates, contracts, and commands. With this cheat sheet at your fingertips, you’ll be able to quickly reference the syntax and semantics of DAML Cheat Sheet and create powerful and secure financial contracts with ease.

    Admin
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    Ammad is the founder and administrator of the website Xtratech.org. With a passion for technology and a drive for innovation, Ammad has dedicated his career to staying ahead of the curve in the fast-paced world of digital advancement. Through Xtratech.org, Ammad continues to share his expertise and provide valuable insights on the latest developments in the tech world.

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