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.
Java script switch code#
Switch is useful when you want to execute one of the multiple code blocks based. 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. The switch is a conditional statement like if statement. However, this is not always the best solution, especially when all of the branches depend on the value of a single variable. In this example, the values 'JavaScript' and 'HTML' share a code block.You can use multiple if.else…if statements, as in the previous chapter, to perform a multiway branch. In JavaScript, you can also share code blocks between values.įor example: // Set the TechOnTheNet technology to JavaScriptĬonsole.log('TechOnTheNet Web Development') In this example, the following will be output to the web browser console log: TechOnTheNet JavaScript Sharing Code Blocks Since the totn_technology variable has been set to the string 'JavaScript', the statements associated with the case 'JavaScript': label will be executed. In this switch statement example, the code will execute different statements depending on the value of the totn_technology variable. The following is example using the switch statement in JavaScript: // Set the TechOnTheNet technology to JavaScriptĬonsole.log('Other TechOnTheNet technologies') Also known as JavaScript switch statement, it is a selection control type that allows the values of a variable or an expression to change the flow of control in. If the default label is found at the end of your switch statement, it is not necessary to include a break statement. It is the block of code that will be executed if none of the values (ie: value1, value2. If you don't include a break statement, JavaScript will continue evaluating the next values in the switch statement and you may get unexpected results. This means that no further values in the switch statement will be compared to expr. It is used to terminate the switch statement. The break statement is an optional statement that generally appears at the end of each code block. It is important to note that the switch statement performs the comparison using the = operator which means that expr must be equal to the value as well as the same data type in order to be considered a match. 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.
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.
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