print a diamond with n size

diamond.js

const N = parseInt(readline());

console.log("#".repeat(N));

for(var i = 1; i < (N * 2); i+=2){
    console.log(" ".repeat((N*2 - i) / 2) + "#".repeat(i));
}
for(var i = N * 2 - 1; i > 0; i-=2){
    console.log(" ".repeat((N*2 - i) / 2) + "#".repeat(i));
}