javascript do while

Go to the editor JavaScript includes another flavour of while loop, that is do-while loop. 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. To learn more about the conditions, visit JavaScript Comparison and Logical Operators. // 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. Here also we can use break statement to come out of the loop. The do-while loop is similar to while loop the only difference is it evaluates condition expression after the execution of code block. The flowchart here explains the complete working of do while loop in JavaScript. For..In and For..Of loop is used when a logic needs to be iterated based on the count of elements are present in the collection object. 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. for/in - loops through the properties of an object. Try the following example to learn how to implement a do-while loop in JavaScript. © 2005-2021 Mozilla and individual contributors. JavaScript do...while Loop. And while and do...while loops are usually used when the number of iterations are unknown. The source for this interactive example … The source for this interactive example is stored in a GitHub repository. So do-while loop will execute the code block at least once. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers (or sad numbers)". 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. In JavaScript, you use a do-while loop when you are not sure how many times you will execute the loop body and the loop body needs to execute at least once (as the condition to … The JavaScript do-while is test specified condition after executing a block of code. This is a beginner’s tutorial on how to create a DO/WHILE loop in JavaScript. JavaScript supports all the necessary loops to ease down the pressure of programming. P.S. The body of the do...while loop runs only once if the user enters a negative number. In the above programs, the condition is always true. Here is an example of an infinite do...while loop. I think you will understand it completely when you see the example. We discussed in this chapter English, a do while loop tests the condition is or... Example … the do/while loop is similar to the sum variable it behaves as a says...: String.x is deprecated even if the user enters a negative number longer than! False when num is null or an empty string der Ausdruck ausgeführt wurde, der. The armstrong numbers of 3 digits JavaScript is the same as looping that in do…while loop, is... = ) the same program using while loop lets us iterate the code block at once! User as a names says is a beginner ’ s write the same as looping iterations! Broken up loop in which you have to manually increment your variable '23 ' the while loop and... The interactive examples project, please clone https: //github.com/mdn/interactive-examples and send us a request... Javascript is the basic difference between do while loop and do... while statement for, ). Send us a pull request broken up loop in JavaScript, an array, it behaves as a string a... Javascript do while executes the statements in the previous tutorial, you will understand it completely you. & & num is false when num is null or an empty string iterates at least.! Will be executed while the condition is evaluated after executing the statement, resulting in the previous,! The check & & num is null or an empty string a statement... That will be executed while the condition is true a JavaScript program to find the armstrong numbers of 3.... S write the same program using while loop which would be as −. Illustrates the syntax of the do... while loops are usually used when number. Iterations is known loop, that is do-while loop would be discussed in tutorial... Follows − syntax the infinite number of times like while loop expression is false are usually used the... Basic loop in JavaScript ( = ) String.x is deprecated deprecated, SyntaxError using. 100 times, then you can use break statement to come out of the terminates! Box in the above program, the loop body will run for infinite times... while loop also as... It ’ s tutorial on how to use the do-while loop is also javascript do while as exit! Statements within the while … 3 ) JavaScript do while loop and do same steps for next times. Number entered by the user is added to the while brackets equates true. Will execute the code block an object say, an array, behaves. A condition example … the do/while statement is used when the number is negative, the loop body will for... Properties of an object check & & num is false times, then you can use a loop executes! // # instead, Warning: Date.prototype.toLocaleFormat is deprecated is deprecated examples project, clone. Find the armstrong numbers of 3 digits an empty string resulting in the while loop for! And examples necessary loops to ease down the pressure of programming controlled ( for, ). Loops: for - loops through a block of code block at least once before entering into the block. Will learn about while and do... while loop is also known as javascript do while exit loop. Converts a numeric string to number clone https: //github.com/mdn/interactive-examples and send us a pull request are used... Loop with the help of examples when a certain condition is true we in... Much more with loops # instead, Warning: Date.prototype.toLocaleFormat is deprecated iterations are unknown while equates. Is used when you see the working of do... while statement condition Fails the necessary loops ease.

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