Nodejs String Truncate truncateString(str, num)

Method Source Code

/*Truncate a string //from www . ja va  2 s.  c  o  m
Truncate a string (first argument) if it is longer than the given maximum string length (second argument). Return the truncated string with a ... ending.

Note that inserting the three dots to the end will add to the string length.

However, if the given maximum string length num is less than or equal to 3, then the addition of the three dots does not add to the string length in determining the truncated string.

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String.prototype.slice()*/
function truncateString(str, num) {
  if (str.length <= num) {
    return str;
  } else {
    return str.slice(0, num > 3 ? num - 3 : num) + '...';
  } 
}

truncateString("A-", 1);

Related

1. truncate(options)

   String.prototype.truncate = function (options) {
     var length = (options && options.length) || 50;
     var ending = (options && options.ending) || "...";
     var truncated = this.slice(0, length);
     if (truncated.length < this.length)
       truncated += ending;
     return truncated;
   };
   

2. truncate(options)

   String.prototype.truncate = function (options) {
     var length = (options && options.length) || 70;
     var ending = (options && options.ending) || "...";
     var truncated = this.slice(0, length);
     if (truncated.length < this.length)
       truncated += ending;
     return truncated;
   };
   

3. truncate(x)

   String.prototype.truncate = function(x){
     return this.length > x ? this.substr(0,x) : this ;
   

4. truncate(x)

   String.prototype.truncate = function(x){
     if(this.length < x) return this.valueOf();
     else return this.substring(0, x - 3) + "...";
   };
   

5. truncateFilename()

   String.prototype.truncateFilename = function() {
       var fileParts = this.split('.');
       var extension = fileParts[fileParts.length-1];
       var filename = this.substr(0, this.length - extension.length + 1);
       return filename.substr(0, 10) + '*.' + extension;
   };
   

6. truncateString(str, num)

   function truncateString(str, num) {
     if(str.length > num){
       if(num < 3){
          str = str.slice(0,num) + "...";
       }else{
       str = str.slice(0,num-3) + "...";
       console.log("actual str is " + str);
     }else{
   ...
   

7. truncateString(str, num)

   function truncateString(str, num) {
     var trunc;  
     if (num <= 3) {
       if (num < str.length){
         return str.slice(0,num) + "...";
       } else{
       trunc = str.slice(0,num);
       return trunc;
     } else if (num >= str.length) {
       return str;
     } else {
       trunc = str.slice(0,num - 3);
       return trunc + "...";
   truncateString("A-tisket a-tasket A green and yellow basket", 11);