Operators:

Operators are symbols or keywords that perform operations on variables and values. In programming, operators are used to manipulate data and perform calculations.

String Operations:

String operators are used to manipulate text. Common string operations include:

Concatenation: Joining two or more strings together.

Example: "Hello" + " " + "World" results in "Hello World".

Length: Finding the number of characters in a string.

Example: "Hello".length would return 5.

Comparison: Checking if two strings are equal or comparing them lexicographically.

Example: "apple" == "banana" results in false.

Example: (from code)

  var key = ""  //key

Mathematical Operations:

Mathematical operators are used to perform arithmetic calculations. Common operations include:

Addition (+): Adding two values.

Example: 5 + 3 results in 8.

Subtraction (-): Subtracting one value from another.

Example: 7 - 2 results in 5.

Multiplication (*): Multiplying two values.

Example: 4 * 3 results in 12.

Division (/): Dividing one value by another.

Example: 10 / 2 results in 5.

Modulus (%): Finding the remainder of a division.

Example: 10 % 3 results in 1.

Example: (from code)

this.positionX += speed;
frame = (frame + 1) % obj.frames;

Boolean Expressions:

Boolean operators are used to evaluate logical conditions, typically returning true or false. Common boolean operations include:

AND (&&): Returns true if both conditions are true.

Example: (5 > 3) && (4 < 6) results in true.
OR (   ): Returns true if at least one condition is true. 
Example: (5 > 3) || (4 > 6) results in true.

NOT (!): Reverses the boolean value.

Example: !(5 > 3) results in false because 5 > 3 is 
true, and the NOT operator negates it.

Example: (from code)

if (this.positionX > viewportWidth - this.pixels) {
}