let count = 15
let arInt1 = new Array(count)
arInt1[0] = 1
//arInt1 is [1,,,,,,,,,,,,,,]
console.log(`arInt1 is "${arInt1}"`)

//ECMAScript 6 feature
let arInt2 = new Array(count).fill(0)
arInt2[0] = 1
//arInt2 is [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
console.log(`arInt2 is ${arInt2}`)