Nodejs String Filter filter(f)

Method Source Code

String.prototype.filter = function(f) {
  return this.split("").filter(f).join("");
};

Related

1. filter(func)

   String.prototype.filter = function(func) {
     str = this.split("");
     var ans = [];
     str.forEach(function(x) {
       if (func(x)) {
         ans.push(x);
       };
     });
     return ans;
   ...