When you want to get a shallow copy of object. Use {...obj1} syntax. If you want to copy 2 objects to 1. Use {...obj1, ...obj2} method.
{...obj1}
{...obj1, ...obj2}
Example
let defaultOptions = { a: 1, b: 2} function myFuntion(input, options={}) { let newOptions = {...defaultOptions, ...options} ... }
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When you want to get a shallow copy of object. Use
{...obj1}syntax. If you want to copy 2 objects to 1. Use{...obj1, ...obj2}method.Example