Is it possible to call a variable by concatenating two strings in JavaScript? -

i'm trying condense code , i've looked @ number of articles on concatenating variables haven't been able work way need to.

below 2 snippets of code. functionally identical except first snippet has variables use 'str' in name , second snippet uses 'dex' instead. plan on creating similar code 'int' , 'ht' don't want copy / paste , go change 'str, dex, int, ht' names on code on , on again.

is possible put 'str, dex, int, ht' variable [var1] (according button pressed) , use [var1] in place of 'str, dex, int, ht' code has written once?

//define stength increase function var strincrease = function () { //increase playerstrength 1     playerstr = playerstr + 1;     playerstrdisplay.innerhtml = playerstr; //increase strengthcp 10     strcp = strcp + strcost;     strcpdisplay.innerhtml = strcp; //decrease totalcp 10     totalcp = totalcp - strcost;     totalcpdisplay.innerhtml = totalcp; }  //define dexterity increase function var dexincrease = function () { //increase playerdexterity 1     playerdex = playerdex + 1;     playerdexdisplay.innerhtml = playerdex; //increase dexteritycp 20     dexcp = dexcp + dexcost;     dexcpdisplay.innerhtml = dexcp; //decrease totalcp 20     totalcp = totalcp - dexcost;     totalcpdisplay.innerhtml = totalcp; } 

you define attributes properties of objects , access them using strings, this:

var player = {     str: 1,     dex: 1,     in: 1,     ht: 1,     strcp: 10,     dexcp: 10,     intcp: 10,     htcp: 10,     totalcp: 0 }, costs = {    strcost: 10,    dexcost: 10,    incost: 10,    htcost: 10 };  function increaseattribute(player, costs, attr) {     player[attr] += 1;     player[attr + "cp"] += costs[attr + "cost"];     player.totalcp += costs[attr + "cost"]; . . }  function increasestr () {    increaseattribute(player, costs, attr); } . . .