Priority Operator / JavaScript

# Web Site Writing Basics

# javascript

# operator

JavaScript (Operator Precedence) is the priority that operators in JavaScript are emulated when multiple operators are in the same expression.

This knowledge is particularly important in writing the correct JavaScript code, because it determines which parts of the expression will be calculated first and which parts will be calculated later, which affects the final value of the expression.

Working Principles and Examples

Processing sequence

In JavaScript, each type of operator has its own priority:

High order: will be processed first, such as parentheses (), function calls, Unary operators (such as + +, --,!).

Intermediate order: e.g., arithmetic operators include multiplication *, division /, addition +, subtraction -.

Low order: will be processed later, for example, Comparison Operators include = =, = =, >, <, and Assignment Operators include =.

The difference example

Consider the following expressions:

Let result = 2 + 3 × 4;

If no Operator Precedence (processed from left to right):

2 + 3 is 5.

5 × 4 will get 20.

According to JavaScript's Operator Precedence:

Multiplication * has a higher priority than addition +.

So, 3 × 4 will be processed first, so 12.

And then, 2 + 12 is going to be 14 → this is the correct value.

Use of brackets ()

You can use the bracket () to determine the priority by yourself. The bracket has the highest priority (highest among Operator Precedence) and will always cause the section in the bracket to be processed first:

Let result = (2 + 3) 4;

2 + 3 is processed first because it is in parentheses, so 5.

5 × 4 is 20.

Using parentheses allows the code to be clear and prevents mistakes from misunderstandings in priorities, sir.

Operator precedence is the rule that determines which operators are processed first when there are multiple operators in the same equation. In general, higher priority operators are processed first, such as multipliers (\ (*\)) and divisors (\ (/\)) are processed before positive (\ (+\) and negative (\ (-\). We can use parentheses (\ (()\) to change the processing order. RPeykc.rWIipd {font-size: var (-m3t5); font-weight: 500; line-height: var (-m3t6); margin : 20px 0 10px 0} .f5cPye ul {font-size: var (--m3t7); line-height: var (--m3t8); margin: 10px 0 20px 0; padding-inline-start: 24px} .f5cPye. WaaZC: first-of-type ul: first-child {margin-top: 0} .f5cPye ul.qh1nvc {font-size: var (--m3t7); line-height: var (--m3t8)} .f5cPye li {padding-left: 4px; margin-bottom: 8px; list-style: inherit} .f5cPye li.K3KsMc {list-style-type: none} .f5cPye > ul: last-child, .f5cPye ol > last-child, f5cPye ul.smXe: last-child >, f5cPol {0) (\ bye *) (\ bf *))) (\ bf * -0) Multiply: (\ (*\)) and divide (\ (/\)) Modulus: (\ (\)) Addition: (\ (+\)) and Subtraction (\ (-\)) Comparison Operators: (\ (<, >\) and others) Logic Operators: (\ (!, &, |\))) Configuration Operators: (\ (=, + =, - =\) Operators (Operators) in JavaScript - MarcusCode 17 Aug 2020 - and this is a table of logical operators in JavaScript. Operator Symbols Example & Logical AND. & bba & bc. | | Logical OR. a | MarcusCode Grievances about the JavaScript operator: What does that symbol mean? Translated - Key points. The JavaScript operator is a special symbol that operates on variables and values, which is important for the calculation and management of data. The mathematical operator is..sitepoint.com example 3 + 4 * 5 will get a result of 23 because * has a higher priority than + (3 + 4) * 5 will get a result of 35 because the bracket will force + to run first * 2 + + + x will evaluate + + x first, so If x is 5, + + x becomes 6 and the result is 2 + 6 = 8.