JavaScript variable as a function and getting data returned

Question

Here's my JS snippet, which is all part of a VAR call.

                    $showNextMonth,
                    $showNextMonthFunction = new function() {
                        if ($monthsLeft <= 9) {
                            $showNextMonth = '+1'
                        } else {
                            $showNextMonth = '0'
                        }
                    },

As you can see, i'm population $showNextMonth based of the IF condition. While this works, it seems sloppy. How could i use a Return, an then just use $showNextMonthFunction where i need to.

I'm sure this is a dupe, but i couldn't find a fit, so if there is one, please let me know.

Remove the new as you're assigning a function to a variable, not creating an instance of a object. — evolutionxbox
– evolutionxbox, Commented Mar 15, 2017 at 12:38
Are you sure using strings of numbers is the best way of doing it? — Waxi
– Waxi, Commented Mar 15, 2017 at 12:39
I need the string, as the jqueryUI datepicker needs a string when modifing the date range. to change the year range it's like -10:+3. So 10 back, and 3 forward type of thing. — Mark Handy
– Mark Handy, Commented Mar 15, 2017 at 12:51

Abhinav · Accepted Answer · 2017-03-15 12:51:18Z

1

try this

$showNextMonthFunction = function() {
    return ($monthsLeft <= 9 ? "+1" : "0");
 }();

answered Mar 15, 2017 at 12:51

Abhinav

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5 Comments

Mark Handy Over a year ago

Thanks. I was hitting a wall using return as i kept getting an object.

Abhinav Over a year ago

glad to help :)

Mark Handy Over a year ago

What do the trailing parentheses do?

Abhinav Over a year ago

unless you include trailing parentheses, function is consider as an value for the var and will return your whole function as a string. When you hit trailing parentheses, JS will consider it as a function and will return your value from logic inside the function block. Hope this helps :)

Mark Handy Over a year ago

Thanks. That's why i switch from using Return. Helps alot!

Jérémy Giuseppi · Accepted Answer · 2017-03-15 13:27:27Z

1

Much simplier :

showNextMonth = monthsLeft <= 9 ? '+1' : '0';

answered Mar 15, 2017 at 13:27

Jérémy Giuseppi

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Comments

Zakaria ASSANI · Accepted Answer · 2017-03-15 12:45:10Z

0

if i understand your question you want something like this:

$showNextMonthFunction = function() {
    return ($monthsLeft <= 9 ? "+1" : "0");
 }

answered Mar 15, 2017 at 12:45

Zakaria ASSANI

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Comments

m_callens · Accepted Answer · 2017-03-15 16:48:02Z

-1

$showNextMonthFunction = function() {
    if ($monthsLeft <= 9) 
        return '+1';
    return '0';
}

edited Mar 15, 2017 at 16:48

m_callens

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answered Mar 15, 2017 at 12:39

dev

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1 Comment

codechurn Over a year ago

While this answer provides source code, it should also include some narrative to describe the answer.

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