push new element from another array, not working

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i'm having problems with the code i made below
i'm not sure whats wrong with it, could someone hint me

JavaScript

var myarr = ['tpc001:10','tpc003:5','tpc000:4','tpc001:7','tpc003:4','tpc008:1'];
var sumarr =[];  // i create an empty array
myarr.sort();    // sorting myarr

sumarr.push(myarr[1]); // add first element of myarr to sumarr.


alert(sumarr[1]);   // error undefinied, but i just pushed a string value to it ??

Posted 14-Nov-11 4:04am

PGT

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Manfred Rudolf Bihy · Accepted Answer · 2011-11-14T04:42:00

OK, I'll give you a hint. Indices start from zero (0) in javascript. So if you have an empty array like sumarr in your example and then push one element onto that array (LIFO fashion) how many elements are now in the array?
If there are m elements in an array and one wants to get at the m^th element with 0 < m <= n the index of that element will be m-1.

Cheers!

—MRB

JavaScript

var myarr = ['tpc001:10','tpc003:5','tpc000:4','tpc001:7','tpc003:4','tpc008:1'];
var sumarr =[];  // i create an empty array
myarr.sort();    // sorting myarr

sumarr.push(myarr[1]); // add the second element of myarr to sumarr.


alert(sumarr[0]);   // Since there is only one element in sumarr that's all you will get here