JavaScript Expressions Complete Reference

Last Updated : 07 Aug, 2023

JavaScript’s expression is a valid set of literals, variables, operators, and expressions that evaluate a single value that is an expression. This single value can be a number, a string, or a logical value depending on the expression.

Example:

Javascript

// Illustration of function* expression
// use of function* keyword
function* func() {
    yield 1;
    yield 2;
    yield 3;
    yield " - Geeks";
}
 
let obj = '';
 
// Function calling
for (const i of func()) {
    obj = obj + i;
}
 
// Output
console.log(obj);

Output

123 - Geeks

The Complete List of JavaScript Expressions is listed below:

JavaScript Primary Expressions

Expressions	Description	Example
this keyword	That defines the current line of code’s execution context.	Try
Async/Await Function	Checks that we are not breaking the execution thread.	Try
Object initializer	They have properties and methods attached to them and properties are in the form of key-value pairs.	Try
Grouping operator	The Grouping operator consists of a pair of parentheses around an expression.	Try
async function	The async function is declared using the async keyword.	Try
Regular Expressions	The search pattern can be used for text search and text to replace operations.
function* Expression	Define a generator function inside an expression.	Try
Function Expression	Define a function inside an expression.	Try
class Expression	The class name is used internally, but not outside of the class.	Try