Otherwise, the loops will continue running indefinitely.Įnroll in our Intro to Programming Nanodegree Program today to learn more about TOPIC and other programming concepts. They each execute instructions repeatedly until a condition is met that prevents further execution, but programmers must make sure the loops’ end conditions are met. Javascript while loops and do-while loops are basic Javascript control structures similar to for loops. the break outerloop causes execution to continue here Conclusion This expression, called the end condition, determines when the while loop should stop executing the instructions in its code block.Ī while loop looks like this: while (condition) Javascript While LoopsĪ Javascript while loop always starts with the keyword while followed by an expression in parentheses. This article also covers some caveats when using either of those loops. In this article, we define what a Javascript while loop is and how it differs from the do-while loop. Although they have similar functions, important differences between them make them useful in slightly different circumstances. To avoid ending up in an infinite loop while using a for statement, ensure that the statements in the for() block never change the value of the loop counter. The counter is increased by a specific value every time the loop runs. It uses a counter, whose value is first initialized, and then its final value is specified. It is very handy to execute a block of code a number of times. The Javascript standard specifies two different types of while loops: the simple while loop and the do-while loop. The For Loop is the most basic way to loop in your JavaScript code. While loops are part of a programming statement class called “control statements,” since they influence the logical flow of a program. The Javascript while loop is a programming construct that executes a set of statements as long as a certain condition is true.
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