Javascript Array Sum via for loop

let theArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
let total1 = 0, total2 = 0;

// iterates through the elements of the array in order and adds 
// each element's value to total1
for ( let i = 0; i < theArray.length; i++ ) 
   total1 += theArray[ i ];                 

console.log( "Total using subscripts: " + total1 );