CODEWITHSUNDEEP
javascriptecmascript-6jsx
Jose Cabrera Zuniga
Jose Cabrera Zuniga

Reputation: 2625

JavaScript6: adding element (key, value) to a ES6 map

In jsx I have a map like: 

var myMap=Map([['rowNumber', '30'], ['id', '80'], ['firstName', '180'], ['lastName', '180'], ['mobile', '180'], ['username', '180'], ['password', '180']])

how can I do programatically add new element like: ['ssn', '12'] to this map?

Upvotes: 0

Views: 500

Answers (3)

Nenad Vracar
Nenad Vracar

Reputation: 122057

You can use set() method with spread syntax to add array of two elements as key and value.

var myMap = new Map([['rowNumber', '30'], ['id', '80'], ['firstName', '180'], ['lastName', '180'], ['mobile', '180'], ['username', '180'], ['password', '180']])

myMap.set(...['ssn', '12'])
for(var i of myMap) console.log(i)

Upvotes: 1

Jordan Soltman
Jordan Soltman

Reputation: 3883

Take a look at the Map reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

You can add items to a map with: myMap.set(keyString, "value associated with 'a string'");

Upvotes: 1

Bergi
Bergi

Reputation: 664599

You're looking for the set method:

myMap.set('ssn', '12');

If you have an entry tuple, you can use

const newEntry = ['ssn', '12'];
myMap.set(newEntry[0], newEntry[1]);
// or also
myMap.set(...newEntry) // however that might be confusing

Upvotes: 4

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