Nodejs String Sub String subStringCounter(searchString)

Method Source Code

//Write a JavaScript function that finds how many times a substring is contained in a given text (perform case insensitive search).

var text = 'this is  test test test we in are is';

String.prototype.subStringCounter = function (searchString) {
    var position = 0,
        counter = 0;// w ww.  j  a va 2  s.  c o  m

    searchString = searchString.toLowerCase();

    while (this.indexOf(searchString, position) >= 0) {
        counter += 1;
        position = this.toLowerCase().indexOf(searchString, position) + 1;
    }

    return counter;
};

console.log(text.subStringCounter('in'));
console.log(text.subStringCounter('we'));

Related

1. sub(pattern, replacement, count)

   String.prototype.sub = function(pattern, replacement, count) {
     replacement = this.gsub.prepareReplacement(replacement);
     count = count === undefined ? 1 : count;
     return this.gsub(pattern, function(match) {
       if (--count < 0) return match[0];
       return replacement(match);
     });
   };
   

2. sub(pattern, replacement, count)

   String.prototype.sub = function(pattern, replacement, count) {
     var replacer = Object.isFunction(replacement) ?
       replacement :
       function(){ return replacement };
     count = Object.isUndefined(count) ? 1 : count;
     return this.gsub(pattern, function(match) {
       if (--count < 0) return match[0];
       return replacer(match);
     });
   ...
   

3. subString()

   String.prototype.subString = function(){
       var arr = [];
       for(var i = 0; i < this.length; i++){
           for(var j = i + 1; j < this.length + 1; j++){
               arr.push(this.slice(i, j));
       return arr;
   console.log("dog".subString());
   

4. subString()

   String.prototype.subString = function()   
     var subset = [];  
     for (var m = 0; m < this.length; m++)   
       for (var n = m+1; n<this.length+1; n++)   
         subset.push(this.slice(m,n));  
     return subset;  
   };  
   console.log("dog".subString());
   

5. subStrings()

   String.prototype.subStrings = function () {
     var substrings = [];
     for (var i = 0; i < this.length ; i++) {
       for (var j = i+1; j <= this.length; j++) {
         substrings.push(this.slice(i,j));
       };
     };
     return substrings;
   };
   ...
   

6. subStrings()

   String.prototype.subStrings = function () {
     var subs = [];
     for (var i = 0; i < this.length; i++) {
       for (var j = i + 1; j < this.length; j++) {
         subs.push(this.slice(i, (j + 1)));
     return subs;
   };
   ...
   

7. subStrings()

   String.prototype.subStrings = function () {
     var subs = [];
     for (var i = 0; i < this.length; i++) {
       for (var j = i+1; j <= this.length; j++) {
         subs.push(this.slice(i,j));
       };
     };
     var sorted = subs.sort();
     var uniques = [sorted[0]];
   ...
   

8. subStrings()

   String.prototype.subStrings = function () {
     result = [];
     for (var beginning = 0; beginning < this.length; beginning++) {
       for (var end = beginning + 1; end < this.length + 1; end++) {
         result.push(this.slice(beginning, end));
     return result
   var a = "cat";
   var b = a.subStrings();
   console.log(b);