KCL language preview

1. A schema with validation

a schema definition and a check block

horizon-dark

# a schema with a check block
schema Person:
    name: str
    age: int

    check:
        age >= 0, "age must be non-negative"

people = [Person {name = "Alice", age = 30}]

atom-one-dark

# a schema with a check block
schema Person:
    name: str
    age: int

    check:
        age >= 0, "age must be non-negative"

people = [Person {name = "Alice", age = 30}]

github-dark

# a schema with a check block
schema Person:
    name: str
    age: int

    check:
        age >= 0, "age must be non-negative"

people = [Person {name = "Alice", age = 30}]

dracula

# a schema with a check block
schema Person:
    name: str
    age: int

    check:
        age >= 0, "age must be non-negative"

people = [Person {name = "Alice", age = 30}]

nord

# a schema with a check block
schema Person:
    name: str
    age: int

    check:
        age >= 0, "age must be non-negative"

people = [Person {name = "Alice", age = 30}]

github

# a schema with a check block
schema Person:
    name: str
    age: int

    check:
        age >= 0, "age must be non-negative"

people = [Person {name = "Alice", age = 30}]

2. Decorators

the @deprecated and @info decorators

horizon-dark

@deprecated(version = "1.0", reason = "use Widget instead")
schema OldWidget:
    name: str

atom-one-dark

@deprecated(version = "1.0", reason = "use Widget instead")
schema OldWidget:
    name: str

github-dark

@deprecated(version = "1.0", reason = "use Widget instead")
schema OldWidget:
    name: str

dracula

@deprecated(version = "1.0", reason = "use Widget instead")
schema OldWidget:
    name: str

nord

@deprecated(version = "1.0", reason = "use Widget instead")
schema OldWidget:
    name: str

github

@deprecated(version = "1.0", reason = "use Widget instead")
schema OldWidget:
    name: str

3. String interpolation

interpolating a variable into a string

horizon-dark

name = "world"
greeting = "Hello, ${name}!"

atom-one-dark

name = "world"
greeting = "Hello, ${name}!"

github-dark

name = "world"
greeting = "Hello, ${name}!"

dracula

name = "world"
greeting = "Hello, ${name}!"

nord

name = "world"
greeting = "Hello, ${name}!"

github

name = "world"
greeting = "Hello, ${name}!"