Answers for "add value to map"

java add to map

HashMap<String, String> map = new HashMap<>();
map.put("key", "value");

append to map javascript

var myMap = {};

myMap[newKey] = newValue;

// ...


// Another method

var myMap = new Map()
myMap.set("key0","value")
// ...
myMap.has("key1"); // evaluates to false, assuming key1 wasn't set