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const { dogName = 'snickers' } = { dogName: undefined }
console.log(dogName) // what will it be? 'snickers'!
const { dogName = 'snickers' } = { dogName: null }
console.log(dogName) // what will it be? null!
const { dogName = 'snickers' } = { dogName: false }
console.log(dogName) // what will it be? false!
const { dogName = 'snickers' } = { dogName: 0 }
console.log(dogName) // what will it be? 0!
const { dogName = 'snickers' } = { }
console.log(dogName) // what will it be? 'snickers'!
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let a, b;
[a=5, b=7] = [1];
console.log(a); // 1
console.log(b); // 7