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The JavaScript Switch Statement. Use the switch statement to select one of many code blocks to be executed. Syntax. switch (expression) { case x: // code block. break; case y: // code block. break; default: // code block. } This is how it works: The switch expression is evaluated once.
11 sty 2011 · It is better to have both a static check and a dynamic check than only the dynamic check. That's a reason against defaults in enum switches. Leaving out the default case enables the compiler to optionally warn or fail when it sees an unhandled case.
25 lip 2024 · The switch statement evaluates an expression, matching the expression's value against a series of case clauses, and executes statements after the first case clause with a matching value, until a break statement is encountered. The default clause of a switch statement will be jumped to if no case matches the expression's value.
The default keyword specifies some code to run if there is no case match. There can only be one default keyword in a switch. Although this is optional, it is recommended that you use it, as it takes care of unexpected cases. Syntax. switch (expression) { case n:
6 sie 2021 · console.log("Number 3 in a string"); break; default: console.log("Number not present"); break; } break statements will break out of the switch when the case is matched. If break statements are not present, then the computer will continue through the switch statement even if a match is found.
25 kwi 2022 · The switch has one or more case blocks and an optional default. It looks like this: switch(x) { case 'value1': // if (x === 'value1') ... [break] case 'value2': // if (x === 'value2') ... [break] default: ... [break] }
26 sie 2021 · The switch statement is closely related to a conditional statement containing many else if blocks, and they can often be used interchangeably. In this tutorial, we will learn how to use the switch statement, as well as how to use the related keywords case, break, and default.
