you can use method string.padEnd that fill string with blank space until parameter pass to the method

var arg = 5;
var string = ' ';
string = string.padEnd(arg)
console.log('"' + string + '"');

reference : https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd

I don't think there is a way to console.log on the same line. You can do something like this

var arg = 5
var string = ' '
var final_string = ''
for (let i = 0; i < arg; i++)
  final_string = final_string + string
}
console.log('"' + final_string + '"')

I think you can use   or \xa0 for printing spaces

var arg = 5
var string = '\xa0\xa0\xa0\xa0\xa0';
for (let i = 0; i < arg; i++) {
  console.log('"' + string + '"')
}