Truncated a string with a number of characters without truncating words

Question

I want to truncate a string with a limit of characters and a condition for the last character that should be a space (this way I have no truncated words)

Example :

var sentence = "The string that I want to truncate!";
sentence.methodToTruncate(14); // 14 is the limit of max characters 
console.log("Truncated result : " + sentence); // Truncated result : The string

yeah, we need to see an effort, we can't just write your code for you — Cubemaster, Jul 26 '18 at 15:29
One way this : `sentence.substring(0,sentence.length - 14));` — Fobos, Jul 26 '18 at 15:36
@Nerdvoso: I don't think that does what's suggested. `sentence.substring(0, 14)` is closer, but ignores the issue of avoiding partial words. A solution is not difficult, but I'd prefer to see the OP put in some effort before posting one. — Scott Sauyet, Jul 26 '18 at 15:43
I agree with @ScottSauyet, before posting anything I would like to see what OP has tried. — J. Pichardo, Jul 26 '18 at 15:44
Possible duplicate of [Shorten string without cutting words in JavaScript](https://stackoverflow.com/questions/5454235/shorten-string-without-cutting-words-in-javascript) — M. Rizzo, Jul 26 '18 at 16:19

score 2 · Accepted Answer · answered Jul 26 '18 at 15:56

2

You can use truncate one-liner below:

const sentence = "The string that I want to truncate!";

const truncate = (str, len) => str.substring(0, (str + ' ').lastIndexOf(' ', len));

console.log(truncate(sentence, 14));

answered Jul 26 '18 at 15:56

Viktor Vlasenko

2,332
14
16

score 1 · Answer 2 · answered Jul 26 '18 at 15:45

Here's how you can truncate by words and given limit -

String.prototype.methodToTruncate = function(n) {
    var parts = this.split(" ");
    var result = "";
    var i = 0;
    while(result.length >= n || i < parts.length) {
       if (result.length + parts[i].length > n) {
           break;
       }
       
       result += " " + parts[i];
       i++;
    }
    
    return result;
}

var sentence = "The string that I want to truncate!";
console.log("Truncated result : " + sentence.methodToTruncate(14)); // Truncated result : The string

Thanks for your answer :) – Brahim LAMJAGUAR Jul 30 '18 at 09:38 — Brahim LAMJAGUAR, Jul 30 '18 at 09:38

Pierre Capo · Answer 3 · 2018-07-26T15:58:42.807

First you can have a max substring of your string, and then recursively remove the letters until you find spaces. Note that this response is made without doing monkey patching and so, not extending String.prototype :

var sentence = "Hello a";
var a = methodToTruncate(sentence, 5); // 14 is the limit of max characters 
console.log("Truncated result : " + a); // Truncated result : The string 

function methodToTruncate(str, num) {

 if(num>= str.length){ return str;}
  var res = str.substring(0, num);
  
  while (str[res.length] != " " && res.length != 0) {
    console.log(res.length)
    res = res.substring(0, res.length-1);
  }
  return res;
}

Thanks for your answer :) – Brahim LAMJAGUAR Jul 30 '18 at 09:38 — Brahim LAMJAGUAR, Jul 30 '18 at 09:38

Truncated a string with a number of characters without truncating words

3 Answers3