What does this simple javascript code means

Question

1.00/5 (1 vote)

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JavaScript

switch(prompt("Whatistheweatherlike?"))


{
case"rainy":
console.log("Remembertobringanumbrella.");
break;
case"sunny":
console.log("Dresslightly.");
case"cloudy":
console.log("Gooutside.");
break;
default:
console.log("Unknownweathertype!");
break;
}

My question is how the first line works?

switch(prompt("Whatistheweatherlike?"))

Basically, we are comparing user input and printing a message.

Usually, we use prompt("message",""); to store a variable. My question is why we havnt stored value in any variable?

Posted 2-Jan-15 8:34am

ankur1163

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2 solutions

Solution 2

Well,
this is quite simple.
When you run this and switch gets hit, it prompts the user to input What the weather is like?
Window Prompt() in javascript means that everything in the window gets overboard by the prompt dialog or dialog, which asks the user to input based on the questions with a Ok and Cancel button, On click of Ok, the Case statements gets checked and the output message gets logged.
And based on the input by the user case is checked and output message is printed in the console log.
Fiddle[^]
Please check the fiddle also.
I hope this helps.
Thanks.:)

Posted 2-Jan-15 8:55am

Suraj Sahoo | Coding Passion

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Doug Vanderweide · Accepted Answer · 2015-01-02T08:50:00

Solution 1

A switch statement is basically an if statement, that doesn't repeat the question.

What you have above is the functional equivalent of:

JavaScript

var response = switch(prompt("Whatistheweatherlike?"));

if(response == rainy) {
console.log("Remembertobringanumbrella.");
}
else if(response == "sunny") {
console.log("Dresslightly.");
}
else if(response == "cloudy") {
console.log("Gooutside.");
}
else {
console.log("Unknownweathertype!");
}

Posted 2-Jan-15 8:50am

Doug Vanderweide

Updated 2-Jan-15 9:05am

v2

Comments

ankur1163 2-Jan-15 14:57pm

so, in switch statement. if(response==rainy) is automatically done in the background. correct?

Doug Vanderweide 2-Jan-15 15:05pm

Yes.