Table of contents
No headersThis section describes all JavaScript statements. JavaScript statements consist of keywords used with the appropriate syntax. A single statement may span multiple lines. Multiple statements may occur on a single line if each statement is separated by a semicolon.
| Statement | (description) |
|---|---|
| block | A block statement is used to group zero or more statements. The block is delimited by a pair of curly brackets. |
break | Terminates the current loop, switch, or label statement and transfers program control to the statement following the terminated statement. |
const | Declares a read-only, named constant. |
continue | Terminates execution of the statements in the current iteration of the current or labelled loop, and continues execution of the loop with the next iteration. |
debugger | Invokes any available debugging functionality. If no debugging functionality is available, this statement has no effect. |
do...while | Creates a loop that executes a specified statement until the test condition evaluates to false. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once. |
export | Allows a signed script to provide properties, functions, and objects to other signed or unsigned scripts. This feature is not in ECMA-262, Edition 3. |
for | Creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement executed in the loop. |
for...in | Iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed. |
for each...in | Iterates a specified variable over all values of object's properties. For each distinct property, a specified statement is executed. |
function | Declares a function with the specified parameters. |
if...else | Executes a statement if a specified condition is true. If the condition is false, another statement can be executed. |
import | Allows a script to import properties, functions, and objects from a signed script that has exported the information. |
| label | Provides a statement with an identifier that you can refer to using a break or continue statement. |
let | Declares a local variable, optionally initializing it to a value. |
return | Specifies the value to be returned by a function. |
switch | Evaluates an expression, matching the expression's value to a case label, and executes statements associated with that case. |
throw | Throws a user-defined exception. |
try...catch | Marks a block of statements to try, and specifies a response, should an exception be thrown. |
var | Declares a variable, optionally initializing it to a value. |
while | Creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated before executing the statement. |
with | Extends the scope chain for a statement. |
