# API

Syntek provides a JavaScript API that can be used for creating interactive assignments. It allows JavaScript to create functions and variables, execute functions, and access variables.

# Assignments

Assignments can range anywhere from making a calculator to writing a piece of logic for snake. Assignments are also able to disable pieces of functionality in Syntek, such as operators.

# Example

Below are several assignment ideas.

# Calculating

Because Syntek allows functionality to be disabled, operators such as * can be removed. This can be used to create an assignment where multiplication and pow have to be made using only +. This would make the code for the assignment similar to the following code.

function multiply(a, b)
  sum = 0
  repeat b times
    sum = sum + a
  return sum

function pow(base, exponent)
  sum = base
  repeat exponent - 1 times
    sum = multiply(sum, base)
  return sum

# Snake

The code that has to be written for a snake assignment would look similar to the following code.

direction = 1

function arrowUp()
    direction = 0

function arrowRight()
    direction = 1

function arrowDown()
    direction = 2

function arrowLeft()
    direction = 3

function loop()
    if direction is 0
        moveUp()
    else if direction is 1
        moveRight()
    else if direction is 2
        moveDown()
    else if direction is 3
        moveLeft()

The functions arrowUp, arrowRight, arrowDown and arrowLeft would be called from the browser when the user presses any of the arrow keys. loop would be called every second to simulate an event loop. The functions moveUp, moveRight, moveDown and moveLeft would call a function in the browser, which moves the snake character.

The code behind the assignment would look similar to the code below.

syntek.createFunction('moveUp', () => {
  // Handle logic for moving the snake up
});

syntek.createFunction('moveRight', () => {
  // Handle logic for moving the snake right
});

syntek.createFunction('moveDown', () => {
  // Handle logic for moving the snake down
});

syntek.createFunction('moveLeft', () => {
  // Handle logic for moving the snake left
});

document.addEventListener('keydown', (event) => {
  switch (event.key) {
    case 'ArrowUp':
      syntek.executeFunction('arrowUp');
      break;
    case 'ArrowRight':
      syntek.executeFunction('arrowRight');
      break;
    case 'ArrowDown':
      syntek.executeFunction('arrowDown');
      break;
    case 'ArrowLeft':
      syntek.executeFunction('arrowLeft');
      break;
    default:
      break;
  }
});

setInterval(() => {
  syntek.executeFunction('loop');
}, 100);