Nodejs String Contains contains(subString)

Method Source Code

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

Related

1. contains(string)

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

2. contains(string, index)

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

3. contains(string, index)

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

4. contains(stringSet)

   String.prototype.contains = function(stringSet) {
     for (var i=0;i<stringSet.length;i++) {
        if (this.indexOf(stringSet[i]) >= 0)
           return true;
     return false;
   };
   

5. contains(strings, index)

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

6. contains(substr)

   String.prototype.contains = function(substr)
     return this.indexOf(substr) > -1;
   

7. contains(substring)

   String.prototype.contains = function(substring) {
     return !!this.match(new RegExp(substring, 'i'));
   

8. contains(substring)

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

9. 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;