Once a value matches expr, the switch statement will execute the corresponding statements. These values are preceded by the case keyword and are evaluated in the order listed. value_n These are the values that are compared to expr. getMonth ( ) method returns a number fromĠ being January and 11 attached to December.The syntax for the switch statement in JavaScript is: switch (expr) Parameters or Arguments expr An expression whose value is compared to a set of values (ie: value1, value2. First, we will use the newĭate ( ) method to find a number corresponding to the current month, and apply that to the month variable. We will categorize these months into seasons of a year. To illustrate this concept, we will provide an example with the months of the year. In such scenarios, we can specify more than one case for each block of code.
#Java script switch code
If you want to have more than one case with the same code block, it is also possible. Here the output will be B, despite the fact that even C and D are also matching the expression. Just like theĮlse if statement, the first statement which matches the specified value will be executed.
Hence, whichever case statement matches the true value, it will be executed. Unlike the above code examples, here we have set the expression in the parenthesis as We will take a number and then, convert it into grade using the below categorization: Let’s demonstrate this use case with the help of an example. We can do this by setting our expression to But there can be times when it is needed to test against a range of values as opposed to a single value. Until now, we have been looking at very simple use cases. This makes the program more efficient and faster. However, here in this code, default will never be called since there are only a finite number of days of the week.īreak statement makes sure that once the case has been matched, no further cases are matched and the control comes out of the The default code block is placed so that if no case is matched, we can handle this scenario. The output will be different depending on the day you have run the code. GetDate ( ) method, it will be tested against the cases one at a time, starting from the top. In short, the syntax of the switch statement is written as: Switch statement is no different from the Then, it executes the block of code matching the outcome. Switch statement works by comparing the value of a variable against possible expressions.
#Java script switch how to
We will also learn how to use theĭefault statements within the switch block to direct the flow of control. Switch statement in Javascript and implement it to build complex control structures. It is also ideal for the scenarios with multiple possible outcomes. Depending on the matching use case, one or more blocks of code can be executed. Switch statement makes the control flow easy to read by making the decision against some possible outcomes to the expression.
In Javascript, conditional blocks can be built using We use them to dictate the behavior of execution upon some condition. Conditional statements are one of the most important control flows in any programming language.
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