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js startWith endWith

 
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String.prototype.startWith=function(str){

if(str==null||str==""||this.length==0||str.length>this.length)

  return false;

if(this.substr(0,str.length)==str)

  return true;

else

  return false;

return true;

}

 

String.prototype.endWith=function(str){

if(str==null||str==""||this.length==0||str.length>this.length)

  return false;

if(this.substring(this.length-str.length)==str)

  return true;

else

  return false;

return true;

}

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