How to check an array?

Question

JavaScript

Hello.
How to check an array for the presence of elements in this way:

var a = ["as", "sa", "ds"];
myFunc("sa", "as", "ds"); -> 1
myFunc("sa", "as", "k"); -> 0
myFunc("sa", "as", "ds", "sa", "as", "ds"); -> 2

Answer 1

var a = ["as", "sa", "ds"];
function myFunc() {
  var results = [];
  for(var i in a) {
    results.push(0);
  }
  for(var i = 0; i < arguments.length; i++) {
    var index = a.indexOf(arguments[i]);
    if(index != -1) {
      results[index] += 1;
    }
  }
  return Math.min.apply(Math, results);
}

myFunc("sa", "as", "ds"); // 1
myFunc("sa", "as", "k"); // 0
myFunc("sa", "as", "ds", "sa", "as", "ds"); // 2
myFunc("sa", "as", "ds", "sa", "as", "ks");// 1