js spread object

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What’s is the benefit / drawback of these two alternatives?

Using object spread

options = ...optionsDefault, ...options;

Or using Object.assign

options = Object.assign(, optionsDefault, options);

 

Code Sample (doubles as compatibility test)

var x = a: 1, b: 2 ;

var y = c: 3, d: 4, a: 5 ;

var z = ...x, ...y;

console.log(z); // a: 5, b: 2, c: 3, d: 4

 

https://stackoverflow.com/questions/32925460/object-spread-vs-object-assign

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