New Map Object Javascript
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New Map Object Javascript
Get() gets the value for a key in a map: You can observe the contents of the items variable in the console by typing: The latter in particular makes it impossible to just pass a function reference in the callback, requiring an in.
Javascript objects vs maps differences between javascript objects and maps: Set() sets the value for a key in a map: The items variable you created holds an empty map object.
We use the javascript spread operator to include all existing object property values along with the new properties that need to be added to object entries.
Let map = new map(); It looks like javascript object but it is not. Maps have several advantages over objects for storing user data. Static properties get map [@@species] the constructor function that is used to create derived objects.
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