Nodejs String Contains contains(token, ignoreCase)

Method Source Code

String.prototype.contains = function(token, ignoreCase) {
   var _reg = 0, str = this.toString(), i;
   if(str && typeof token === "string") {
      if(ignoreCase === true) {
         token = token.toLowerCase();//from  w ww.  jav  a2  s  .  c om
         str = str.toLowerCase();
      }
      while((i = str.indexOf(token)) !== -1) {
         str = str.substring(i + token.length);
         _reg++;
      }
   }
   return _reg;
};

Related

1. contains(substring)

   String.prototype.contains = function(substring) {
     return this.indexOf(substring) != -1;
   

2. contains(substring, ignoreCase)

   String.prototype.contains = function(substring, ignoreCase) {
     var lowerSubString = substring.toLowerCase(),
     lowerThis = this.toLowerCase();
     if (ignoreCase) {
       return lowerThis.indexOf(lowerSubString) > -1;
     } else {
       return this.indexOf(substring) > -1;
   

3. contains(t)

   String.prototype.contains = function (t) {
       return this.indexOf(t) != -1;
   };
   

4. contains(term)

   String.prototype.contains = function(term){
     return this.indexOf(term) > -1;
   };
   

5. contains(text)

   String.prototype.contains = function (text) {
       return this.toLowerCase().indexOf(text.toLowerCase()) !== -1;
   };
   

6. contains(txt)

   String.prototype.contains = function(txt)
       return (this.indexOf(txt) >= 0);
   

7. contains(value)

   String.prototype.contains = function (value) {
       "use strict";
       var containsValue = false;
       if (this.indexOf(value) >= 0) {
           containsValue = true;
       return containsValue;
   };
   

8. containsAll(strings, index)

   String.prototype.containsAll = function(strings, index) {
     if(!Array.isArray(strings)) throw Error('1 argument is not an array');
     return strings.every(string => this.includes(string, index), this);
   

9. contains(substring)

   String.prototype.contains = function contains(substring) {
     return this.indexOf(substring) !== -1;
   };