i use hashmap in order to store the key value pair of the map.Please suggest me if their is an alternative way to do the same using NOdejs.
var HashMap=require('hashmap');
var map=new HashMap();
map.set("amit",[1,2]);
map.set("amit",[3,4]);
console.log(map.get("amit"));
On console it print [3,4], i want [1,2,3,4]. How am i going to approach this. if value in the value variable repeated then i also want to increase the count of the value corresponding to the same key.
You are overwriting the amit keys value every time you call set on that key. Unless there is some specific API support in hashmap, your best bet is to concatenate the previous value on every set call.
Consider:
var HashMap = require("hashmap")
var map = new HashMap()
map.set('amit', [1,2])
// Concat previous value with [3, 4]
map.set('amit', map.get('amit').concat([3,4]))
console.log(map.get('amit'))
// [1, 2, 3, 4]
You could also make an abstraction for this. The following is a simple example, you would most likely want to extend it further in a real use-case.
// concatSet('foo', [1, 2])
// concatSet('foo', [3, 4])
// console.log(map.get('foo')) => [1, 2, 3, 4]
function concatSet(key, value) {
// empty array if not exists
var prevValue = map.get(key) || []
return map.set(key, prevValue.concat(value))
}
[1, 4, 5] should be [1,1,4,5]?You have to loop the map.
map.set(1, "test 1");
map.set(2, "test 2");
map.set(3, "test 3");
map.forEach(function(value, key) {
console.log(key + " : " + value);
});
