count string value using map in javascript, return NaN -

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I am trying to use a map to measure the duplicate string number in an array, my code: < / P> 

  var map = {}; Var Mearer = ["John", "John", "John", "Do", "Do", "Smith", "John", "Do", "Jo"]; (Var a = 0; a & lt; myarray.length; a ++) {if (map [mare [a]] == tap) {map [marta [a]] + = 1; } And {Map [Mareare [A]] = 1; }}

But when I do console.log (map); gives it 

  object {John: NaN, Doe: Nain, Smith: Nain, Joe: Nain}

Why is this Nyan? ? I should have a similar result: 

  John: 4, DOE: 3, Smith: 1, Joe: 1

How can I do this? Thank you in advance.

In this case you null strictly === < / Code> because is not equal to null . Try it: 

  if (map [mare [a]] = tap) {

or simply: 

  (Map [Mareare [A]]) {

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