turnLeft

Category:Turtle

turnLeft(angle)

Category: Turtle

Rotates the turtle left by the specified angle. The turtle’s position remains the same.

turnLeft() is one of the ways to change the turtle's orientation. When used with moveForward(), you can move, and draw with, the turtle anywhere on the screen.

Examples

// Rotate the turtle left 90 degrees (the default angle) from the current direction.
turnLeft();

Example: Square Draw a square with left turns only.

// Draw a square with left turns only.
moveForward();
turnLeft();
moveForward();
turnLeft();
moveForward();
turnLeft();
moveForward();
turnLeft();

Example: Checkmark Draw a checkmark with left turns using angle parameters.

// Draw a checkmark with left turns using angle parameters. 
turnLeft(120);
moveForward(100);
turnLeft(270);
moveForward(25);

Example: House Draw a house with left turns only.

// Draw a house with left turns only.
turnLeft(45);
moveForward(50);
turnLeft(90);
moveForward(50);
turnLeft(45);
moveForward(75);
turnLeft(-270); // same as turnLeft(90);
moveForward(70);
turnLeft(90);
moveForward(75);

Syntax

turnLeft(angle)

Parameters

Name	Type	Required?	Description
angle	number	No	The angle to rotate left (90 degrees is default).

Returns

No return value. Rotates turtle only.

Tips

You can specify a negative angle to rotate left, which makes the turtle turn right instead.
There are three ways to rotate the turtle in place
- turnRight(angle) - Rotates the turtle right by the specified angle relative to the current turtle direction. The turtle’s position remains the same.
- turnLeft(angle) - Rotates the turtle left by the specified angle relative to the current turtle direction. The turtle’s position remains the same.
- turnTo(angle) - Rotates the turtle to a specific angle. 0 is up, 90 is right, 180 is down, and 270 is left. The turtle’s position remains the same.

Found a bug in the documentation? Let us know at documentation@code.org