programming-for-dummies

490
Branching Statements
The decrement operator works the same way except that it subtracts 1 from
a variable, such as
j = 5;
i = --j;
In this example, the value of i is j - 1 or 4, and the value of j is also 4.
If you place the decrement operator after the variable, such as
j = 5;
i = j--;
Now the value of i is 5, but the value of j is 4.
Assignment operators
Most programming languages use the equal sign to assign values to variables,
such as
i = 59;
However, JavaScript also includes combination assignment and mathematical
operators, as shown in Table 3-4.
Table 3-4
Assignment Operators
Assignment Operator Purpose Example
+= Addition assignment i += 7 (equivalent to i = i + 7)
-= Subtraction assignment i -= 4 (equivalent to i = i - 4)
*= Multiplication assignment i *= y (equivalent to i = i * y)
/= Division assignment i /= 3.5 (equivalent to i = i / 3.5)
%= Modulo assignment i %= 2.8 (equivalent to i = i % 2.8)
Branching Statements
The simplest branching statement is an IF statement that only runs one or
more commands if a Boolean condition is True, such as
if (condition) {
Command;
}