Nodejs String Starts With startsWith(matchString)

Method Source Code

String.prototype.startsWith = function (matchString) {
    //if exact match return true
    if (this == matchString)
        return true;
    //  w ww  .ja v  a  2 s.  co  m
    var matchString = '^' + matchString + '[\x20-\x7E]+$';
        
    var regex = new RegExp(matchString);
    return !!this.match(regex);
};

Related

1. startsWith( pattern )

   String.prototype.startsWith = String.prototype.startsWith || function ( pattern ) {
       return this.lastIndexOf(pattern, 0) === 0;
   

2. startsWith( str )

   String.prototype.startsWith = function( str ) {
       if ( str.length > this.length ) {
           return false;
       return( String( this ).substr( 0, str.length ) == str );
   };
   

3. startsWith( value )

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

4. 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){
   ...
   

5. startsWith(e,t)

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

6. startsWith(needle)

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

7. startsWith(needle)

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

8. startsWith(needle)

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

9. startsWith(other)

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