snippets.md

Frendli Code Snippets

Below are the copyable code snippets that are also shown with syntax highlighting in the images.

Variables, Data Types, and Literals

create age = 30               // number
create price = 4.25           // number
create isValid = true         // boolean
create isOnline = false       // boolean
create nickname = empty       // empty
change nickname = "Alex"      // text

Control Flow

Selection

// Selection

create score = 5
create message = ""

if score > 10
    change message = "Very Good"
otherwise if score > 5
    change message = "Good"
otherwise
    change message = "Bad"

Bounded Loop

// Bounded loop

create count = 0

repeat 5 times
    change count = count + 1
    display(send count)

Unbounded Loop

// Unbounded loop

create max = 5
create count = 0

repeat while count < max
    change count = count + 1
    display(send count)

Functions

// Function

define add(accept a, b)
    create result = a + b
    return with result

create result = add(send 1, 2)
display(send result)

OOP

(paused feature, may be removed)

// Class

describe Point
    has x
    has y

    define onNew(accept x, y)
        change me.x = x
        change me.y = y

    define move(accept x, y)
        change me.x = me.x + x
        change me.y = me.y + y

create pointA = Point(send 1, 2)
pointA.move(send 3, 4)

Small Program

The program does the following:

1. When timeCount() is invoked, it will time how long it takes to count from 0 to target in increments of step, while displaying the current count.
2. If the arguments sent were valid, evaluate() is invoked to evaluate if we guessed the right number of seconds it took to count.

Assumption: Only number data types are passed. (Data type-checking is on the roadmap.)

// Time visibly counting to a target
define timeCount(accept target, step)
    if target <= 0 or step <= 0
        display(send "Numbers must be positive.")
        return

    create count = 0
    create startTime = time()

    repeat while count < target
        change count = count + step
        display(send count)

    create endTime = time()

    return with (endTime - startTime) / 1000

// Evaluate a guess
define evaluate(accept guess, actual)
    if guess equals actual
        display(send "Correct.")
    otherwise if guess < actual
        display(send "Too low.")
    otherwise
        display(send "Too high.")

// Start the count
create target = 100
create step = 1
create result = timeCount(send target, step)

// Guess the number of seconds
if result unequals empty
    create guess = 0.01
    evaluate(send guess, result)