How do I calculate and return a value using a JavaScript object method

Question

I have created this object:

var resultStats = {
    possibleResults: 10,
    validResults: 5,
};

What would I write so that writingresultsStats["calculateSuccessRate()"] (or similar) will calculate Math.round(100*this.validResults/this.possibleResults); and return the answer of 50.

Justin Niessner · Accepted Answer · 2012-08-09 19:17:02Z

3

var resultStats = {
    possibleResults: 10.0,
    validResults: 5.0,
    calculateSuccessRate: function(){
        return Math.round(100 * this.validResults/this.possibleResults);
    }
};

The function could then be called using:

resultStats["calculateSuccessRate"]();

Or:

resultStats.calculateSuccessRate();

answered Aug 9, 2012 at 19:17

Justin Niessner

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2 Comments

Ry- Over a year ago

(N.B. If you don't need to access the property dynamically, the bottom method is preferred.)

Wk_of_Angmar Over a year ago

Thanks! But why is the bottom method preferred?

The Internet · Accepted Answer · 2012-08-09 19:19:57Z

1

var resultStats = {
    calculateSuccessRate : function() {
       return Math.round(100 * (this.possibleResults / this.validResults))
    },
    possibleResults: 10,
    validResults: 5
};

edited Aug 9, 2012 at 19:19

answered Aug 9, 2012 at 19:17

The Internet

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Comments

gen_Eric · Accepted Answer · 2012-08-09 19:17:14Z

0

You could a calculateSuccessRate function to the resultStats object.

var resultsStats = {
    possibleResults: 10,
    validResults: 5,
    calculateSuccessRate: function(){
        return Math.round(100*this.validResults/this.possibleResults);
    }
};

Then you can call it like:

resultsStats.calculateSuccessRate();

OR (you were close):

resultsStats["calculateSuccessRate"]()

answered Aug 9, 2012 at 19:17

gen_Eric

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