javascript - How do I add new properties to an array of objects? I'm trying to use $.map -


i have array of 1300+ objects. these objects jeans properties such waist, knee, thigh, , cuff measurements.

i'm looking add 4 new properties each object in array:

var getresults = function(){     results = $.map(dbcontent,function(i){         (i).riseprox = "0";         (i).thighprox = "0";         (i).kneeprox = "0";         (i).cuffprox = "0";

when run this, says riseprox undefined. i'm trying add these 4 new properties every object. please help. :)

var getresults = function(){ results = $.map(dbcontent,function(i){     //create counter proximity     (i).riseprox = 0;     (i).thighprox = 0;     (i).kneeprox = 0;     (i).cuffprox = 0;     //start iterating , adding counter     //check rise     if ((i).rise >= (psobject.rise-qinch) && (i).rise <= (psobject.rise+qinch)){         riseprox+=3}     else if ((i).rise >= (psobject.rise-hinch) && (i).rise <= (psobject.rise+hinch)){         riseprox+=2}     else if ((i).rise >= (psobject.rise-inch) && (i).rise <= (psobject.rise+inch)){         riseprox++};     //check thigh     if ((i).thigh >= (psobject.thigh-qinch) && (i).thigh <= (psobject.thigh+qinch)){         thighprox+=3}     else if ((i).thigh >= (psobject.thigh-hinch) && (i).thigh <= (psobject.thigh+hinch)){         thighprox+=2}     else if ((i).thigh >= (psobject.thigh-inch) && (i).thigh <= (psobject.thigh+inch)){         thighprox++};     //check knee     if ((i).knee >= (psobject.knee-qinch) && (i).knee <= (psobject.knee+qinch)){         kneeprox+=3}     else if ((i).knee >= (psobject.knee-hinch) && (i).knee <= (psobject.knee+hinch)){         kneeprox+=2}     else if ((i).knee >= (psobject.knee-inch) && (i).knee <= (psobject.knee+inch)){         kneeprox++};     //check cuff     if ((i).cuff >= (psobject.cuff-qinch) && (i).cuff <= (psobject.cuff+qinch)){         cuffprox+=3}     else if ((i).cuff >= (psobject.cuff-hinch) && (i).cuff <= (psobject.cuff+hinch)){         cuffprox+=2}     else if ((i).cuff >= (psobject.cuff-inch) && (i).cuff <= (psobject.cuff+inch)){         cuffprox++};     //create totalprox evaluate total proximity or likeness in size     i.totalprox = i.riseprox + i.thighprox + i.kneeprox + i.cuffprox;     console.log(i.totalprox) });

};

this entire function. i'm trying compare psobject (selected jean size) every jean in database determine jeans closest match. intended creating riseprox etc. properties , increasing them 1, 2, , 3 depending on how close matches are.

i dont see returning (i) item $.map function.

also see mapping using reduce this:

var getresults = function(){     return dbcontent.reduce(function(mapped, item){        item.riseprox = "0";         item.thighprox = "0";         item.kneeprox = "0";         item.cuffprox = "0";          mapped.push(item);        return mapped;    }, []); };

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