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Make A List Comma And "and"-separated

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You have strings with a separator character (a space or something else) like the following: '1 2 3' '1 2' '1' What is the best/elegant way in Javascript to format them in the foll

Solution 1:

Got this somewhere on StackOverflow a few years ago. This is a very basic implemenation -- it wouldn't be hard to add a delimiter parameter to the method.

functionformatList(myString){
        if ( myString.indexOf(" ") === -1 ) return myString;

        if ( myString.indexOf(" ") === myString.lastIndexOf(" ") ){
            return myString.replace(" ", " and ");
        } 

        var former = myString.substr(0, myString.lastIndexOf(" "));
            former = former.replace(/ /g,", ");

        var latter = myString.substr(myString.lastIndexOf(" "), myString.length -1);
        var output = former + " and " + latter;

        return output; 
    }

formatList("1"); // 1formatList("1 2"); // 1 and 2formatList("1 2 3"); // 1, 2 and 3formatList("1 2 3 4"); // 1, 2, 3 and 4

Solution 2:

You can use this:

<!DOCTYPE html><html><body><script>
cars=["Elem 1","Elem 2","Elem 3","Elem 4"];
var s = '';
var sep = '';
for (var i=0;i<cars.length;i++)
{
  if(i==cars.length-1){
    s=s+" and "+cars[i];
  }else{
   s=s+sep+cars[i];
   sep = ', ';
  }
}
document.write(s + "<br>");
</script></body></html>

Solution 3:

This one works if you have an array too. It uses the Query $.inArray that can be omitted if you do not use jQuery and input only in array form or string form.

// Transform a string made of substrings separated by a separator (default "#")// or an array in a string that is comma (", ") separated and that has an "and" // separaing the last element. // Ex: //     toCommaAnd("1#2#3")     -> "1, 2 and 3"//     toCommaAnd("1 2 3"," ") -> "1, 2 and 3"//     toCommaAnd("Mr. Cinelli#Ms. Cinelli") ->"Mr. Cinelli and Ms. Cinelli"//     toCommaAnd(["a", "b"])  -> "a and b"//// !!  toCommaAnd("1#2#3#")    ->   become "1, 2 and 3" TOO so you can //                                  concatenate  elements in loops without //                                  caring about special case for first or//                                  last element.  functiontoCommaAnd(str, separator) {
      var ar = $.isArray(str) ? str : str.split(separator || "#"),  
          commaUntil = ar.length - 1,
          ret = ar[0], 
          i;

      //This is just for the 1#2#3# cases.if (commaUntil > 0 && ar[commaUntil] === ""){
          commaUntil--;
      }

      for (i = 1; i < commaUntil; i++){
          ret += ", " + ar[i];
      }
      if (commaUntil > 0)
          ret += " and " + ar[commaUntil];

      return ret ;
  },

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