Manual check vs Default parameter

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Manual check
const a = (b) =>{
	if (!b) { b = {} }
	const c = b.toString()
}

a()
a({})
a({ d: 1 })
ready
Default parameter
const a = (b = {}) =>{
	const c = b.toString()
}

a()
a({})
a({ d: 1 })
ready

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