Javascript Object Addition Assignment Operator -


i trying use addition assignment operator within javascript object in order add number of votes in student election. given following:

var votes = {   "alex": { president: "bob", vicepresident: "devin", secretary: "gail", treasurer: "kerry" },   "bob": { president: "mary", vicepresident: "hermann", secretary: "fred", treasurer: "ivy" },   "cindy": { president: "cindy", vicepresident: "hermann", secretary: "bob", treasurer: "bob" },   "devin": { president: "louise", vicepresident: "john", secretary: "bob", treasurer: "fred" },   "ernest": { president: "fred", vicepresident: "hermann", secretary: "fred", treasurer: "ivy" },   "fred": { president: "louise", vicepresident: "alex", secretary: "ivy", treasurer: "ivy" },   "gail": { president: "fred", vicepresident: "alex", secretary: "ivy", treasurer: "bob" },   "hermann": { president: "ivy", vicepresident: "kerry", secretary: "fred", treasurer: "ivy" },   "ivy": { president: "louise", vicepresident: "hermann", secretary: "fred", treasurer: "gail" },   "john": { president: "louise", vicepresident: "hermann", secretary: "fred", treasurer: "kerry" },   "kerry": { president: "fred", vicepresident: "mary", secretary: "fred", treasurer: "ivy" } };

i trying preform for/in loop in order count , create new object names of candidates , number of votes have:

var president = {}; (var student in votes) {   president[votes[student].president] += 1; };

which, know, gives me nan values.

how key of property increase each iteration?

the problem not initializing value. first time encounter name, have president[votes[student].president] undefined, undefined + 1 give nan, thereafter each addition give nan since nan + 1 nan

var president = {}, president; (var student in votes) {     president = votes[student].president;     if (!president[president]) {         president[president] = 0;     }     president[president] += 1; };

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