Javascript Map One Object To Another

Object maps inherit unwanted keys from the prototype. Note that, as jcalz remarks, object.fromentries was introduced in es2019. In addition, a map object remembers the original insertion order of the keys.

Here is an example i wrote to show how you can use the spread operator to merge two objects and then log the key/values of the merged object:. There cannot be two properties in an object with the same key or two entries in a map with the same key. As the map is an object in javascript, it.

Modified 7 years, 7 months ago.

New map() creates a new map: It creates a new array without modifying the elements of the original array. Ask question asked 2 years, 1 month ago. Javascript objects vs maps differences between javascript objects and maps: