Merge map values

Mohan.Radhakrishnan at Mohan.Radhakrishnan at
Tue Apr 28 10:02:00 UTC 2015

It could be something like this. But if this is done internall then we don't need code to explicitly manipulate the Map.

let m = new Map();
//set other keys

//for (let value of m.entries()){

    //if (Object.keys(m).every((key) => m[key] == value[key])){


From: Radhakrishnan, Mohan (Cognizant)
Sent: Tuesday, April 28, 2015 2:23 PM
To: 'es-discuss at'
Subject: Merge map values


I am using ES6 by transpiling. The features remind me of Java lambdas.

If I have a string 'mainn' then my map should contain this.

[a=1, i=1, m=1, n=2]

Java : Example. I may not need the TreeMap here.

String s  = "__mainn__".replaceAll("[^a-z\\s]", "");

final Map<Character, Integer> count = s.chars().
        collect(TreeMap::new, (m, c) -> m.merge((char) c, 1, Integer::sum), Map::putAll);

What could be the es6 equivalent ?

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