javascript switch number
Free 30 Day Trial Stack Overflow works best with JavaScript enabled This is the perfect @Switz - Just keep in mind that 999 < 1000 falls into case 0 but Math.round(999/1000) falls into case 1. It is slow in every tested environment, and takes almost 10 times as long in MSIE.EDIT: since this solution keeps getting upvotes, I must advice that You can create a custom object with the criteria and the function corresponding to the criteriaDefine functions for what you want to do in these cases (define function1, function2 etc)Many times if statements are easier to read and maintain.
Where using multiple Here is an example of a switch case in javascript for numbers. statement with fixed values. The number could be greater than, equal to or lower than a particular test value, right? If no default label is found, the program continues to the statement(s) A strict comparison can only be true if the operands are of the same type.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: When I looked at the solutions in the other answers I saw some things that I know are bad for performance. The Overflow Blog I tried commenting on Guffa's answer, but I cannot due to my low ranking.
Please keep in mind that you should only use switch as a conditional for specific values. I would recommend the above only when you have a lot of conditions Untested and unsure if this will work, but why not do a few Updating the accepted answer (can't comment yet). It is almost 30 times slower in Chrome than using However such performance penalty is negligible when the data being handled is not big and maybe its a function applied only, like validating a single user input, then readability is chosen rather than performance in such case. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesdoes your steps are regular ? The switch condition statement in Javascript lets you perform an action based on the value of a particular thing. This is a "timeless" answer, great job and thanks for the jsfiddle!While elegant to code, it hurts performance.
Or if your conditions are regular enough, you could directly call Its rare to see an answer with this much detail and tidy structure. Will add that as an update...it really depends - 15ms "if-immediate" 15ms "if-indirect" 15ms "switch-immediate" 37ms "switch-range" 28ms "switch-range2" 35ms "switch-indirect-array" 29ms "array-linear-switch" 62ms "array-binary-switch" Finished 1.00 ( 15ms) if-immediate 1.00 ( 15ms) if-indirect 1.00 ( 15ms) switch-immediate 2.47 ( 37ms) switch-range 1.87 ( 28ms) switch-range2 2.33 ( 35ms) switch-indirect-array 1.93 ( 29ms) array-linear-switch 4.13 ( 62ms) array-binary-switch chrome Version 48.0.2564.109 (64-bit) mac os x 10.11.3ATM Safari 9.X on Mac OS x and Safari ios 9.3,"if-immediate" is the clear winner1 ms difference is too little to care about. W3Schools is optimized for learning, testing, and training. In some cases, using the switch case statement is seen to be more convenient over if-else statements. All Things JavaScript, LLC 2,277 views 9:57 JavaScript Tutorial in Hindi Part 7: Switch Statement in JavaScript in Hindi | Switch Case in JS - Duration: 16:21.
As of 1/12/16 using the demo jsfiddle in chrome, switch-immediate is the fastest solution.In my case (color-coding a percentage, nothing performance-critical), I quickly wrote this:I had the same situation lately, that's how I solved it:And if you set "1, 2, 3, 4, 5" then it can be even simpler:Thanks for contributing an answer to Stack Overflow!
site design / logo © 2020 Stack Exchange Inc; user contributions licensed under By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The switch expression is evaluated once. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Introduction Managing data is one of the fundamental concepts of programming. Examples of Case Statement in JavaScript are as follows: Example 1. var x = 1; switch (x) {case 0: console.log(“Zero”); break; case 1: another code block:
switch to select one of many blocks of code to be executed. It vary more than that from each test run. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
This is pretty fast in all tested environments, and actually the fastest in MSIE. let a = 2 + 2; switch (a) { case 3: alert( 'Too small' ); break; case 4: alert( 'Exactly!' The point is: Use the coding style that makes sense, and don't try to micro-optimize. In this variant the ranges is stored in an array. Surprisingly it takes Chrome almost 40 times longer to complete this compared to the fastest operation in Chrome, while MSIE only takes 6 times as long. If there is a match, the associated block of code is executed. This explains how to have range of values in case option inside the Javascript switch statement. A switch statement can replace multiple if checks. This is the perfect solution for long, nested if/else statements.
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