Dynamically add data to a javascript map

Question

Is there a way I can dynamically add data to a map in javascript  A map put key value   I am using the yui libraries for javascript  but didn t see anything there to support this

User · Answer

Javascript now has a specific built in object called Map, you can call as follows :

   var myMap = new Map()

You can update it with .set :

   myMap.set("key0","value")

This has the advantage of methods you can use to handle look ups, like the boolean .has

  myMap.has("key1"); // evaluates to false

You can use this before calling .get on your Map object to handle looking up non-existent keys

User · Answer

Well any Javascript object functions sort-of like a  map   randomObject  hello      world     Typically people build simple objects for the purpose   var myMap                myMap newKey    newValue    edit  mdash  well the problem with having an explicit  put  function is that you d then have to go to pains to avoid having the function itself look like part of the map  It s not really a Javascripty thing to do   13 Feb 2014  mdash  modern JavaScript has facilities for creating object properties that aren t enumerable  and it s pretty easy to do  However  it s still the case that a  put  property  enumerable or not  would claim the property name  put  and make it unavailable  That is  there s still only one namespace per object

[javascript] Dynamically add data to a javascript map

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