nitrogen

An interpreted programming language written in Go.

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Assignments

Nitrogen supports reassignable and constant variables. All variables must be declared before they can be assigned. A declaration and assignment can happen at the same time. Here’s some examples:

// Standard variable
let var = "Hello, Earth"

// Constant
const var2 = "Hello, Mars"

// Variables must be declared before assignment
// The following works because var was defined above
var = "Goodbye, Earth"

// The following fails since it hasn't be declared
anotherVar = "This will fail"

// Constants can't be reassigned
var2 = "This also causes an error"

Compound operations and assignments are supported using the compound operators +=, -=, *=, /=, and %=. Each operator will perform the given operation then assign it to the identifier on the left side:

let a = 5

a += 2 // a == 7
a -= 3 // a == 4
a *= 2 // a == 8
a /= 4 // a == 2
a %= 4 // a == 1

Constants

Constants refer to constant references not immutable data. Meaning, a variable cannot be assigned a different value, but the value of the variable can be changed.

For example, the following code is valid. The variable obj is assigned only once, but the object assigned to obj is still mutable.

const obj = {
    a: 1,
    b: 2,
}

obj.a = 3

// obj = {} <- This is invalid because obj cannot be reassigned.

Identifiers

Identifiers are the name of a variable, constant, or function. Identifies must start with a valid UTF-8 character from a Letter category but can be followed by any number of letters, decimal digits, or underscores.

Delete

A non-constant variable can be deleted using the delete statement.

let someVar = 42
delete someVar
// someVar doesn't exist anymore