array.sum()

The sum() method will calculate the numeric sum of array values. Array values that are not numeric are treated as if they were zeros.

Sum as a numeric value.

pjs.define("Num", { type: 'integer', length: 10, dim: 5 });
 
Num[1] = 1;
Num[2] = 2;
Num[3] = 3;
Num[4] = 4;
Num[5] = 5;
 
return Num.sum();
//15