How to check the condition the array contains the element in javascript?

Question

Code:

monthArray = ["jan 2009", ..., "dec 2009"];

The jsonFile contains:

[
    {
        "month": "Aug 2012",
        "no_Of_Commits": 1
    },
    {
        "month": "Jun 2012",
        "no_Of_Commits": 1
    },
    {
        "month": "Apr 2012",
        "no_Of_Commits": 6
    }
]

function populate(jsonFile) {
    tempJson = jsonFile;

    for (var i = 0; i < monthArray.length; i++)
    {       
        if (monthArray.contains(tempJson[i]["month"]))       // condition Not working suggest anything else
        {
            console.log("yes");
            tempJson[i]["no_Of_Commits"] = tempJson[i]["no_Of_Commits"];
        }
        else
        {
            console.log("NO"); 
            jsonFile[i]["no_Of_Commits"] = 0;
        }
    }
}

Answer 1

Replace contains with indexOf

if ( monthArray.indexOf( tempJson[i]["month"] ) !== -1 ) {...

and as you're iterating over one array, and getting values from another array, you better make sure both arrays have the same number of indices etc.