Page 67 - JavaScript

}

Now we can call delta() function passing any integer, both positive and negative, as delta
parameter.

Using modulus to obtain the fractional part of a number

var myNum = 10 / 4; // 2.5
var fraction = myNum % 1; // 0.5
myNum = -20 / 7; // -2.857142857142857
fraction = myNum % 1; // -0.857142857142857

Incrementing (++)

The Increment operator (++) increments its operand by one.

• If used as a postfix, then it returns the value before incrementing.
• If used as a prefix, then it returns the value after incrementing.

//postfix
var a = 5, // 5
b = a++, // 5
c = a // 6

In this case, a is incremented after setting b. So, b will be 5, and c will be 6.

//prefix
var a = 5, // 5
b = ++a, // 6
c = a // 6

In this case, a is incremented before setting b. So, b will be 6, and c will be 6.

The increment and decrement operators are commonly used in for loops, for example:

for(var i = 0; i < 42; ++i)
{
// do something awesome!
}

Notice how the prefix variant is used. This ensures that a temporarily variable isn't needlessly
created (to return the value prior to the operation).

Decrementing (--)

The decrement operator (--) decrements numbers by one.

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