For example. JavaScript DO WHILE loop example. In the above program, the user is prompted to enter a number. When the user enters a negative number, the loop terminates. JavaScript While … The JavaScript do while loop iterates the elements for the infinite number of times like while loop. The do/while loop is a variant of the while loop. And when numeric strings are added, it behaves as a string. The syntax for do-while loop in JavaScript is as follows − do { Statement(s) to be executed; } while (expression); Note − Don’t miss the semicolon used at the end of the do...while loop. Go to the editor Click me to see the solution. JavaScript while Loop and do-while Loop Whenever you want to execute a certain statement over and over again you can use the JavaScript while loop to ease up your work. The source for this interactive example is stored in a GitHub repository. The JavaScript do while loop iterates the loop while loop, but, the difference is that the loop is executed at least once even when the condition is false. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once. specified statement until the test condition evaluates to false. The condition is When the number is negative, the loop terminates; the negative number is not added to the sum variable. SyntaxError: test for equality (==) mistyped as assignment (=)? reiterates until i is no longer less than 5. before executing any of the statements within the while … Finally, the total sum is displayed. We use For Loop when a certain logic needs to execute a certain number of times along with a condition. It's just a simple example; you can achieve much more with loops. 9. The JavaScript do-while loop structure is similar to JavaScript while loop structure but in JavaScript do-while loop structure, the body of loop comes before the test condition or expression. For example, '2' + '3' = '23'. In programming, loops are used to repeat a block of code. If the condition of a loop is always true, the loop runs for infinite times (until the memory is full). To allow scripting on a specific website, while leaving scripting disabled in the Internet zone, add the specific Web site to the Trusted sites zone: On the web browser menu, click Tools, or the "Tools" icon (which looks like a gear) and select Internet Options. Das do...while statement erstellt eine Schleife, die einen bestimmten Ausdruck ausführt, bis die zu überprüfende Aussage falsch wird. The syntax of do while loop is given below. In this tutorial, you will learn about while loop and do...while loop with the help of examples. This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true. Here, the do...while loop continues until the user enters a negative number. The do while loop works similar to while loop, where there are a set of conditions which are to be executed until a condition, is satisfied. evaluated after executing the statement, resulting in the specified statement executing So parseInt() converts a numeric string to number. The JavaScriptdo while loop is different from while loop: using do while loop JavaScript always executes the code at least once - even if the condition is false. JavaScript Comparison and Logical Operators, The body of the loop is executed at first. When developers talk about iteration or iterating over, say, an array, it is the same as looping. Watch Now. Output: Do-While loop: A do-while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block or not depending on a given boolean condition at the end of the block. The JavaScript while statement creates a loop that executes a block of code as long as the test condition evaluates to true. var i=0; do {document.write(i+"
") i++;} while (i <= 5) In the above code condition is checked at the end of the loop only. With a do-while loop the block of code executed once, and then the condition is checked, if the condition is true or false. i.e. Join our newsletter for the latest updates. Warning: JavaScript 1.6's for-each-in loops are deprecated, TypeError: setting getter-only property "x", SyntaxError: Unexpected '#' used outside of class body, SyntaxError: identifier starts immediately after numeric literal, TypeError: cannot use 'in' operator to search for 'x' in 'y', ReferenceError: invalid assignment left-hand side, TypeError: invalid assignment to const "x", SyntaxError: for-in loop head declarations may not have initializers, SyntaxError: a declaration in the head of a for-of loop can't have an initializer, TypeError: invalid 'instanceof' operand 'x', SyntaxError: missing ] after element list, SyntaxError: missing } after function body, SyntaxError: missing } after property list, SyntaxError: missing = in const declaration, SyntaxError: missing name after . Note: do...while loop is similar to the while loop. The JavaScript do-while loop structure is similar to JavaScript while loop structure but in JavaScript do-while loop structure, the body of loop comes before the test condition or expression. so the body of the loop must be executed at least once even if the expression is false. The source for this interactive example … Summary: in this tutorial, you will learn how to use the JavaScript while statement to create a loop. During each iteration, the number entered by the user is added to the sum variable. Hence, the loop body will run for infinite times. This is a beginner’s tutorial on how to create a DO/WHILE loop in JavaScript. The do...while statement creates a loop that executes a for/of - loops through the values of an iterable object. do {Code that will be executed} while (condition) JavaScript supports all the necessary loops to ease down the pressure of programming. Python Basics Video Course now on Youtube! This JavaScript tutorial explains how to use the do-while loop with syntax and examples. // Despite i == 0 this will still loop as it starts off without the test, https://github.com/mdn/interactive-examples, Warning: -file- is being assigned a //# sourceMappingURL, but already has one, TypeError: invalid Array.prototype.sort argument, Warning: 08/09 is not a legal ECMA-262 octal constant, SyntaxError: invalid regular expression flag "x", TypeError: X.prototype.y called on incompatible type, ReferenceError: can't access lexical declaration`X' before initialization, TypeError: can't access property "x" of "y", TypeError: can't assign to property "x" on "y": not an object, TypeError: can't define property "x": "obj" is not extensible, TypeError: property "x" is non-configurable and can't be deleted, TypeError: can't redefine non-configurable property "x", SyntaxError: applying the 'delete' operator to an unqualified name is deprecated, ReferenceError: deprecated caller or arguments usage, Warning: expression closures are deprecated, SyntaxError: "0"-prefixed octal literals and octal escape seq. The only difference is that in do…while loop, the block of code gets executed once even before checking the condition. JavaScript provides both entries controlled (for, while) and exit controlled (do..while) loops. operator, SyntaxError: missing ) after argument list, RangeError: repeat count must be non-negative, TypeError: can't delete non-configurable array element, RangeError: argument is not a valid code point, Error: Permission denied to access property "x", SyntaxError: redeclaration of formal parameter "x", TypeError: Reduce of empty array with no initial value, SyntaxError: "x" is a reserved identifier, RangeError: repeat count must be less than infinity, Warning: unreachable code after return statement, SyntaxError: "use strict" not allowed in function with non-simple parameters, ReferenceError: assignment to undeclared variable "x", ReferenceError: reference to undefined property "x", SyntaxError: function statement requires a name, TypeError: variable "x" redeclares argument, Enumerability and ownership of properties. do { statement block } while (condition); In while loop, the given condition is tested at the beginning, i.e. Then, it will check the condition, and continue to loop again if it is actually true. 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