Question

array = ['item1', 'item2', 'item3', 'item4']
output = array.toString()

This gets me "item1,item2,item3,item4" but I need to turn this into "item1, item2, item3, and item4" with spaces and “and”

How could I construct a regex process to do this rather then substringing and find/replacing?

Is this the best way?

Thanks!

Answer 1

This version handles all the variations I could think of :

function makeList (a) {
  if (a.length < 2)
    return a[0] || '';

  if (a.length === 2)
    return a[0] + ' and ' + a[1];

  return a.slice (0, -1).join (', ') + ', and '  + a.slice (-1);
}    

console.log ([makeList ([]), 
              makeList (['One']), 
              makeList (['One', 'Two']), 
              makeList(['One', 'Two', 'Three']),
              makeList(['One', 'Two', 'Three', 'Four'])]);

// Displays : ["", "One", "One and Two", "One, Two, and Three", "One, Two, Three, and Four"]