Introduction:

Number Types:

  1. Integers

    2. Whole numbers

  2. Floating Point Numbers, or floats

    3. Decimal point numbers such as 1.35.

  3. Special Numbers Numbers, or floats

    4. NaN, Infinity, -Infinity, e.

    NaN: Not a Number. Returned if you try math on text, for example.

    e: 1e9 = I billion (1 with 9 zeros); 1e-9 = minus 1 billion.

When using numbers in Javascript, they are not wrapped in "". In an [array], if they are wrapped in "" they are treated not as numbers but as "strings". In other words, the sum of "12" + "6" will return NaN, or NotaNumber.

Expressions:

Expressions are sums. So 1+3 is an expression. The numbers are operands and the arithmetic operator (+-*/ etc) is an operator.

Thus:

operand operator operand = result

Operators:

  1. Binary

    2. Need two operands

    # Type Example Result Remark
    + Addition 10+5 15
    - Subtraction 10-5 5
    * Multiplication 10*5 50
    / Division 10/5 2
    % Modulus 10%5 0 Remainder: 10/5=2r0
    ** Exponentiation 10**5 100000 The Power Of: 105
  2. Unary

    3. Need one operand

    # Type Example Result Remark
    ++ Increment 10+* 11 Adds 1
    -- Decrement 10-- 9 Subtracts 1
    - Unary Negation -10 Transforms a + into a -
    + Unary Pus =10 Transforms a - into a +
Code Examples
Numbers: Number Methods