For loop trick

Consider the below code

aAge = Array(31,23,42,44,25);  //1
aLength = aAge.length;  //2
for(i=0;i
alert(aAge[i]);   //3

How to avoid line number 2?

aAge = Array(31,23,42,44,25);  //1
for(i=0;i
alert(aAge[i]);   //3

But to avoid length calculation each iteration

aAge = Array(31,23,42,44,25);  //1
for(i=0,aLength=aAge.length;i< aLength;i++)   //2 
alert(aAge[i]);   //3 

A cool trick!! May be useful to you guys!!!