Javascript assign property from function

Question

I don't know if this is possible, but what I'd like to accomplish is assign a property value to an object from a function that is called. When the function for active is ran, I'd like to assign either a true or false as its value as the object is being created. Can we use self-executing functions in this way?

Here's my code, still in-progress, but is there something of this sort that is accomplish able in javascript?

        graphObj.list.push({
            name: graphData[i].name,
            value: Math.floor(graphData[i].time / graphData[graphData.length - 1] * 100),
            str: graphData[i].strTime
            active: (function(){
                if (activeActivityName != "" && graphData[i].name == activeActivityName){
                    return true;
                } else {
                    return false;
                }
            })
        });

This is not a self-invoking function. You would need () at the end for it to be immediately executed. — Matt Browne
– Matt Browne, Commented Mar 21, 2015 at 2:19
Adding a () causes a syntax error, it appears as that isn't the proper syntax if this is possible — reZach
– reZach, Commented Mar 21, 2015 at 2:21

bhspencer · Accepted Answer · 2015-03-21 02:46:12Z

2

I really want to discourage you from using the IIFE here since I strongly believe this is an inappropriate use of IIFE. So how about just assigning the result of the condition:

graphObj.list.push({
    name: graphData[i].name,
    value: Math.floor(graphData[i].time / graphData[graphData.length - 1] * 100),
    str: graphData[i].strTime,
    active: (activeActivityName != "" && graphData[i].name == activeActivityName)
});

answered Mar 21, 2015 at 2:46

bhspencer

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1 Comment

reZach Over a year ago

I do like this approach!

bhspencer · Accepted Answer · 2015-03-21 02:36:10Z

0

Why go down the path of using an Immediately-Invoked Function Expression when you could just call a function.

function isActive(activeActivityName, graphData, i) {
    if (activeActivityName != "" && graphData[i].name == activeActivityName) {
        return true;
    } else {
        return false;
    }
}

graphObj.list.push({
    name: graphData[i].name,
    value: Math.floor(graphData[i].time / graphData[graphData.length - 1] * 100),
    str: graphData[i].strTime,
    active: isActive(activeActivityName, graphData, i)
});

answered Mar 21, 2015 at 2:36

bhspencer

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3 Comments

reZach Over a year ago

I know I'm only going to be using the function in one place, so I thought an IIFE would be best here. Your example is also fine

Scott Sauyet Over a year ago

An anonymous function is fine in that case... so long as it doesn't overcomplicate your code.

bhspencer Over a year ago

That is something of a matter of opinion. Consider this rebuttal. toddmotto.com/avoiding-anonymous-javascript-functions

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