PeriodicLazyCoordinates created by hillal20 - https://repl.it/@hillal20/PeriodicLazyCoordinates

merge.js

let a = [ 1,3,4,7,9]
let b = [ 2,5,6,10,14,18]

function Merge(a,b,n,m){
let c = []
 let i = 0;
 let j = 0;
 let k = 0;

 while( i < n  && j < m){

if(a[i] < b[j]){
          c[k++]= a[i++]
}
else{
         c[k++] = b[j++]
}

 }

for( ; i <  n ; i ++){
    
      c[k++] = a[i]
   

}   

for( ; j <  m ; j ++){

      c[k++] = b[j]
}   

return c 

}
console.log(Merge(a,b,a.length , b.length))