How to return values in javascript

Question

I have a javascript function   function myFunction value1 value2 value3           Do stuff and        value2 somevalue2   to return      value3 somevalue3   to return     function call in Code        myFunction  1  value2 value3    if value2  amp  amp  value3      Do some stuff     in this scenario how to pass value2 and value3 to the called method or how to return values in Java script

User · Answer

I would prefer a callback solution  Working fiddle here  http   jsfiddle net canCu   function myFunction value1 value2 value3  callback         value2    somevalue2     to return     value3    somevalue3     to return      callback  value2  value3        var value1   1  var value2   2  var value3   3   myFunction value1 value2 value3  function value2  value3       if  value2  amp  amp  value3              Do some stuff         alert  value2    -    value3

User · Answer

The return statement stops the execution of a function and returns a value from that function    While updating global variables is one way to pass information back to the code that called the function  this is not an ideal way of doing so  A much better alternative is to write the function so that values that are used by the function are passed to it as parameters and the function returns whatever value that it needs to without using or updating any global variables   By limiting the way in which information is passed to and from functions we can make it easier to reuse the same function from multiple places in our code   JavaScript provides for passing one value back to the code that called it after everything in the function that needs to run has finished running   JavaScript passes a value from a function back to the code that called it by using the return statement  The value to be returned is specified in the return keyword

User · Answer

The answers cover things very well   I just wanted to point out that the mechanism of out parameters  as described in the question isn t very javascriptish   While other languages support it  javascript prefers you to simply return values from functions     With ES6 ES2015 they added destructuring that makes a solution to this problem more elegant when returning an array   Destructuring will pull parts out of an array object   function myFunction value1          Do stuff and      return  somevalue2  sumevalue3     var  value2  value3    myFunction  1     if value2   amp  amp  value3          Do some stuff

User · Answer

function myFunction value1 value2 value3                  return  val2  value2  val3  value3

User · Answer

Its very simple  Call one function inside another function with parameters       function fun1              var a 10       var b 20       fun2 a b     calling function fun2   and passing 2 parameters           function fun2 num1 num2           var sum      sum   num1 num2      return sum           fun1      trigger function fun1

User · Answer

You can return an array  an object literal  or an object of a type you created that encapsulates the returned values   Then you can pass in the array  object literal  or custom object into a method to  disseminate the values   Object example   function myFunction value1 value2 value3         var returnedObject            returnedObject  value1     value1       returnedObject  value2     value2       return returnedObject     var returnValue   myFunction  1  value2 value3    if returnValue value1   amp  amp  returnValue value2      Do some stuff     Array example   function myFunction value1 value2 value3         var returnedArray            returnedArray push value1        returnedArray push value2        return returnedArray     var returnValue   myFunction  1  value2 value3    if returnValue 0    amp  amp  returnValue 1       Do some stuff     Custom Object   function myFunction value1 value2 value3         var valueHolder   new ValueHolder value1  value2        return valueHolder     var returnValue   myFunction  1  value2 value3       hypothetical method that you could build to create an easier to read conditional      might not apply to your situation  if returnValue valid        Do some stuff     I would avoid the array method because you would have to access the values via indices rather than named object properties

User · Answer

It s difficult to tell what you re actually trying to do and if this is what you really need but you might also use a callback   function myFunction value1 callback           Do stuff and        if typeof callback     function            callback somevalue2 somevalue3             myFunction  1   function value2  value3       if value2  amp  amp  value3              Do some stuff

User · Answer

Javascript is duck typed  so you can create a small structure    function myFunction value1 value2 value3                  var myObject   new Object         myObject value2   somevalue2       myObject value3   somevalue3       return myObject      var value   myFunction  1  value2 value3    if value value2   amp  amp  value value3      Do some stuff

[javascript] How to return values in javascript

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