What is the output of the following? “`js const a = {x: 1}; const b = {x: 1}; const m = new Map(); m.set(a, ‘first’); m.set(b, ‘second’); console.log(m.size); console.log(m.get({x:1})); “`

Question

JavaScript Professional — Medium

What is the output of the following? “`js const a = {x: 1}; const b = {x: 1}; const m = new Map(); m.set(a, ‘first’); m.set(b, ‘second’); console.log(m.size); console.log(m.get({x:1})); “`

Accepted Answer

The output is 2, undefined because even though objects `a` and `b` have the same properties, they are considered different keys in the Map. When trying to retrieve the value using a new object with the same properties, it will return undefined.