- Declaring variables -
The Boolean type has two literal values :
Integers can be expressed in decimal (base 10), hexadecimal (base 16), and octal (base 8). An integer must have at least one digit (0-9).
A floating number has the following parts.
The exponent part is an "e" or "E" followed by an integer, which can be signed (preceded by "+" or "-").
An expression is any valid unit of code that resolves to a value. Conceptually, there are two types of expressions: those that assign a value to a variable (a = 12) and those that simply have a value (5-3).
|% (Modulus)||Returns the integer remainder of dividing the two operands.||16 % 5 returns 1.|
|++ (Increment)||Unary operator. Adds one to its operand.||If x is 3, then ++x returns 4, whereas x++ returns 3.|
|-- (Decrement)||Unary operator.||If x is 3, then --x returns 2, whereas x-- returns 3.|
|- (Unary negation)||Unary operator. Returns the negation of its operand.||If x is 3, then -x returns -3.|
|a +=b||a = a + b||Adds 2 numbers and assigns the result to the first.|
|a -= b||a = a - b||Subtracts 2 numbers and assigns the result to the first.|
|a *= b||a = a*b||Multiplies 2 numbers and assigns the result to the first.|
|a /=b||a = a/b||Divides 2 numbers and assigns the result to the first.|
|a %= b||a = a%b||Computes the modulus of 2 numbers and assigns the result to the first.|
|a<<=b||a = a<<b||Performs a left shift and assigns the result to the first operand.|
|a>>=b||a = a>>b||Performs a sign-propagating right shift and assigns the result to the first operand.|
|a>>>=b||a = a>>>b||Performs a zero-fill right shift and assigns the result to the first operand.|
|a&= b||a = a&b||Performs a bitwise AND and assigns the result to the first operand.|
|a^= b||a = a^b||Performs a bitwise XOR and assigns the result to the first operand.|
|a |=b||a = a|b||Performs a bitwise OR and assigns the result to the first operand.|
|Equal (==)||x == y||Returns true if the operands are equal.|
|Strict equal (===)||x === y||Returns true if the operands are equal and of the same type.|
|Not equal (!=)||x != y||Returns true if the operands are not equal.|
|Strict not equal (!==)||x !== y||Returns true if the operands are not equal and/or not of the same type.|
|Greater than (>)||x>y||Returns true if the left operand is greater than the right operand.|
|Greater than or equal (>=)||x>=y||Returns true if the left operand is greater than or equal to the right operand.|
|Less than (<)||x<y||Returns true if the left operand is less than the right operand.|
|Less than or equal (<=)||x<=y||Returns true if the left operand is less than or equal to the right operand.|
|Bitwise AND||a & b||Returns a one in each bit position if bits of both left and right operands are ones.|
|Bitwise OR||a | b||Returns a one in each bit if bits of either left or right operand is one.|
|Bitwise XOR||a ^ b||Returns a one in a bit position if bits of one but not both left and right operand are one.|
|Bitwise NOT||~ a||Flips the bits of its operand.|
|Left shift||a << b||Shifts a in binary representation b bits to the left, shifting in zeros from the right.|
|Sign-propagating right shift||a >> b||Shifts a in binary representation b bits to the right, discarding bits shifted off.|
|Zero-fill right shift||a >>> b||Shifts a in binary representation b bits to the right, discarding bits shifted off, and shifting in zeros from the left.|
|Logical AND &&||a && b||is true if both a and b are true.|
|Logical OR ||||a || b||is true if either a or b is true.|
|Logical NOT !||!a||is true if a is not true.|
The concatenation operator (+) concatenates two or more string values together and return another string which is the union of the two operand strings.
The new operator is used to create an instance of a user-defined object type or of one of the predefined object types Array, Boolean, Date, Function, Image, Number, Object, Option, RegExp, or String.
Syntax : var objectName = new objectType([param1, param2, ..., paramN]);
The this operator is used to refer the current object. In general, this refers to the calling object in a method.Syntax : this["propertyName"]
Label statement provides an identifier for a statement that lets you refer to it using a break or continue statement.JS Bin
Here objects contain -> propertyName: propertyValue pairs.
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