Add strings in an array - Javascript

Question

I have an array of text:

var text = new Array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s");

I would like to add the elements in the array according to a set number and then store these in a new array. For example, if I pick 3, then the resulting strings in the new array (terms) would be: ["a b c", "d e f", "g h i", ...] etc

I looked at Join and I can't get this to work - it seems to only be able to add the entire array together. I'm guessing I need to use a nested loop, but I can't seem to get this to work. Here's my attempt:

//Outer loop
for (i = 0; i < text.length; i++) {
    //Inner loop
    for (j = i; j < i + $numberWords; j++) {
        newWord = text[j];
        newPhrase = newPhrase + " " + newWord;
    }
    terms.push(newPhrase);
    i = i + $numberWords;
}

Salman Arshad · Accepted Answer · 2011-10-25 08:28:57Z

4

You can use various array functions like so:

var input = new Array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s");
var output = new Array();
var length = 3;
for (var i = 0; i < input.length; i += length) {
    output.push(input.slice(i, i + length).join(" "));
}
alert(output);

Variant of the above example:

var input = new Array("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s");
var output = new Array();
var length = 2;
while (input.length) {
    output.push(input.splice(0, length).join(" "))
}
alert(output);

edited Oct 25, 2011 at 8:28

answered Oct 25, 2011 at 8:19

Salman Arshad

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Comments

PiTheNumber · Accepted Answer · 2011-10-25 08:34:43Z

1

Here you go:

var text=new Array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s");

var n = 3;
var a = new Array();
for (var i = 0; i < Math.ceil(text.length / 3); i++)
{
  var s = '';
  for (var j = 0; (j < n) && ((i*n)+j < text.length) ; j++)
  {
    s += text[n*i+j] + ' ';
  }
  a.push(s.trim());
}

edited Oct 25, 2011 at 8:34

answered Oct 25, 2011 at 8:22

PiTheNumber

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2 Comments

Salman Arshad Over a year ago

You could use .ceil() instead of .floor() to grab the 19th element.

PiTheNumber Over a year ago

ah right, I had a floor()+1 when I was testing it and forgot to copy it. But with splice it is way cooler ;)

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