Nullish_Coalescing_Operater_and_Or_equal

??

Nullish: null and undefined.(Not 0 or ‘ ‘),so it’ different from ||

1 2	const value = 0 ?? 10; console.log(value);//0

1 2	const value = null ?? 10; console.log(value);//10

1 2	const value = undefined ?? 10; console.log(value);//10

|| =

1 2	a = a\|\|b a \|\|= b

??=

&&=