1var string = "ABCDEFG";
2var truncString = string.substring(0, 3); //Only keep the first 3 characters
3console.log(truncString); //output: "ABC"

1const truncateString = (str, num) => {
2  
3  /*******  Method One(1)  *******/
4      // Return the actual string if num is equal or greater than str, 
5      // else return the slice/copy the str from index 0 to index n(num), then truncate. 
6    return num >= str.length ? str : str.slice(0, num)+'...'
7    
8  /******* Method Two(2) *******/
9    let newString = ''
10    	// Return same string if number length is greater or equal
11    if(num >= str.length) newString += str; 
12    	// Split each string, set new string to the spliced arr, join the new string and truncate
13    else newString += str.split('').splice(0, num).join('')+'...'
14
15    return newString
16  
17  /******* Method Three(3) *******/
18  let truncateString = ''
19  	// Optimize, to aviod looping through str when it is greater than the num
20  if(num >= str.length) {
21    truncateString = str
22    return truncateString
23    }
24  else for(let i = 0; i < num; i++) truncateString += str[i]
25  return truncateString+'...'
26  	
27  	// OR
28  
29  let truncateString = ''
30  for(let i = 0; i < num; i++) truncateString += str[i]
31  	// Conditionally search to avoid result returning undefined for num greater than str length
32  return num >= str.length ? str : truncateString+'...'
33  
34}
35truncateString("Peter Piper picked a peck of pickled peppers", 11);

1function truncateString(str, num) {
2  // Clear out that junk in your trunk
3  if (str.length > num) {
4    return str.slice(0, num) + "...";
5  } else {
6    return str;
7  }
8}
9

1function truncateString(str, num) {
2 
3  if (str.length > num) {
4    return str.slice(0, num) + "...";
5  } else {
6    return str;
7  }
8}
9
10truncateString("Lorem Ipsum placeholder text in any number of characters, words sentences or paragraphs", 9)  // returns Lorem Ips...
11