In JavaScript we can perform different operations like arithmetic operations and logical operations.
Arithmetic Operations
We can add two or more numbers using +
operator.
2 + 3; // 5
2.3 + 1.4; // 3.7
We can subtract one number from another using -
operator.
5 - 3; // 2
2.3 - 1.4; // 0.9
2.3 - 1.4
in JavaScript returns0.8999999999999999
. Why? That is a separate topic.
Concatenation
When we use +
operator with two strings, we can concatenate them.
"Hello" + "Apple"; // "HelloApple"
Operator and Operands
Consider following operation statement:
2 + 3;
In that 2
and 3
are called operands. +
is called operator.
In the above statement, +
has two operands. Therefore, plus(+
) is a binary operator.
Negation Operator
Negation refers to opposite. If I have a value true
, then negating it results in false
.
!true; // false
Any truthy value in JavaScript can be negated to false
. Example:
!1; // false
!"Apple"; // false
![]; // false
Similarly any falsy value can be negated to true
. Example:
!0; // true
!""; // true
In case of negation operator, there is only one operand involved. Therefore !
operator is an unary operator.