More on JavaScript Operators
Read this article to learn more about using operators in JavaScript. We will not use all of them in this introductory course. However, this is a condensed reference that contains tables of all operator categories. JavaScript categorizes operators by the task (such as arithmetic, comparison, or assignment). Operators execute in a particular order. This is called operator precedence and tells JavaScript which part to evaluate first, second, third, and so on. This is an important concept.
For example, consider how a program calculates a price using arithmetic operators:
Multiplication first the result is: $18 = 4 + 2 * 7 ( 2 * 7 = 14 + 4)
Calculate left to right the result is: $42 = 4 + 2 * 7 (4+ 2 = 6 * 7)
Operators
JavaScript has the following types of operators. This section describes the operators and contains information about operator precedence.
- Assignment operators
- Comparison operators
- Arithmetic operators
- Bitwise operators
- Logical operators
- String operators
- Conditional (ternary) operator
- Comma operator
- Unary operators
- Relational operators
JavaScript has both binary and unary operators, and one special ternary operator, the conditional operator. A binary operator requires two operands, one before the operator and one after the operator:
operand1 operator operand2
For example, 3+4 or x*y.
A unary operator requires a single operand, either before or after the operator:
operator operand
or
operand operator
For example, x++ or ++x.
Source: Mozilla, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
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