how to get the count of specific field from different objects in an array in JS

Question

var Universities = [{
    "State": "ILLINOIS",
    "University": "North Park University",
    "Place": "Chicago"
}, {
    "State": "VERMONT",
    "University": "University of Vermont",
    "Place": "Berlington"
}, {
    "State": "FLORIDA",
    "University": "North Wood University",
    "Place": "Midland"
}, {
    "State": "NEW YORK",
    "University": "Pace State University(undergradations& post graduations",
    "Place": "NY"
}, {
    "State": "ILLINOIS",
    "University": "University of North Alabama",
    "Place": "Florence"
}, {
    "State": "ILLINOIS",
    "University": "Louisiana Technology University",
    "Place": "Ruston"
}, {
    "State": "North Carolina",
    "University": "East Carolina University",
    "Place": "Green Ville"
}, {
    "State": "ARKANSAS",
    "University": "Arkansas State University",
    "Place": "Jones boro"
}, {
    "State": "Oklahoma",
    "University": "University of Tulsa",
    "Place": "Tulsa"
}, {
    "State": "ILLINOIS",
    "University": "Rush University",
    "Place": "Chicago"
}]

How many UNIVERSITIES are there in ILLINOIS state? Please check and help me out.

And what is that you've tried? Stack Overflow isn't a give me the code service. — Amit Joki
– Amit Joki, Commented Apr 18, 2015 at 11:00
Welcome to Stack Overflow. Please review the how-to-ask tips: stackoverflow.com/help/how-to-ask — nestedloop
– nestedloop, Commented Apr 18, 2015 at 11:07
possible duplicate of Count occurances in string from keyword array in javascript — Marcel Burkhard
– Marcel Burkhard, Commented Apr 18, 2015 at 11:20

qianjiahao · Accepted Answer · 2015-04-18 12:12:53Z

1

if i understand your question correctly , maybe use filter can figure it out :

var result = Universities.filter(function (ele) {
    return ele.State == 'ILLINOIS';
});

console.log(result);

answered Apr 18, 2015 at 12:12

qianjiahao

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