In this example, we are using the switch case and each case executes based on the provided value. NOTE: If we do not add the break statement after the code statements in the switch case block, then the interpreter would execute each and every case after the matched case. switch(expression)īased on the value of the expression's output, one of the many cases gets executed, and then the break statement is called which breaks the execution, and the switch case gets exited. The expression which evaluates the condition is written inside the switch(expression), followed by a curly bracket which creates a switch block in which the different cases are defined. JavaScript switch case is used in applications where you have to implement a menu like system in which based on user input certain action is taken. If no case matches then the default case is executed. In switch statement, the switch expression is evaluated only once and then the output is compared with every case mentioned inside the switch block and if the output of expression matches one of the cases then the statement written inside the block of that case is executed. JavaScript switch is a condition-based statement that has multiple conditions but executes only one block at a time. Try the following example to implement switch-case statement.JavaScript Switch case is used to execute a block of statement out of multiple blocks of statements based on a condition. We will explain break statement in Loop Control chapter. If they were omitted, the interpreter would continue executing each statement in each of the following cases. The break statements indicate the end of a particular case. If nothing matches, a default condition will be used.

The interpreter checks each case against the value of the expression until a match is found. The objective of a switch statement is to give an expression to evaluate and several different statements to execute based on the value of the expression. The following flow chart explains a switch-case statement works.

Starting with JavaScript 1.2, you can use a switch statement which handles exactly this situation, and it does so more efficiently than repeated if.else if statements. However, this is not always the best solution, especially when all of the branches depend on the value of a single variable. You can use multiple if.else…if statements, as in the previous chapter, to perform a multiway branch.

Switch case java script