Nodejs String Starts With startsWith(needle)

Method Source Code

/**// w  w w  . j ava2  s.  c o m
 * Return true if the string starts with the needle passed in argument
 */
String.prototype.startsWith = function(needle) {
    return(this.indexOf(needle) == 0);
};

Related

1. startsWith()

   const strPro=String.prototype;
   String.prototype.startsWith||Object.assign(strPro,{
     startsWith(searchString,position){
       if (position) {
         return this.indexOf(searchString) === position;
       return this.indexOf(searchString)===0;
     },
     endsWith(searchString,position){
   ...
   

2. startsWith(e,t)

   String.prototype.startsWith||(String.prototype.startsWith=function(e,t){
        return t=t||0,this.substr(t,e.length)===e}
   );
   

3. startsWith(matchString)

   String.prototype.startsWith = function (matchString) {
       if (this == matchString)
           return true;
       var matchString = '^' + matchString + '[\x20-\x7E]+$';
       var regex = new RegExp(matchString);
       return !!this.match(regex);
   };
   

4. startsWith(needle)

   String.prototype.startsWith = function(needle) {
       return this.substr(0, needle.length) == needle;
   

5. startsWith(needle)

   String.prototype.startsWith = function(needle)
       return(this.indexOf(needle) == 0);
   };
   

6. startsWith(other)

   String.prototype.startsWith = function(other) {
       var length = other.length;
       if (this.length < length)
           return false;
       return this.substring(0, length) == other;
   };
   

7. startsWith(other, case_cmp)

   String.prototype.startsWith = function(other, case_cmp) {
     var first  = this;
     var second = other;
     if(!case_cmp) {
       first  = first.toLowerCase();
       second = second.toLowerCase();
     return (first.indexOf(second) === 0);
   

8. startsWith(pattern)

   String.prototype.startsWith = function(pattern) {
     return this.indexOf(pattern) === 0;
   };
   

9. startsWith(pattern)

   String.prototype.startsWith = function(pattern) {
       return (this.substr(0, pattern.length) == pattern);
   };