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The elvis operators ?: and ?. are safe navigation operators.
?:
?.
However they are serve opposite situations:
If a value is absent, ?: takes the default to the right. ø?:1 == 1 If a value is available, ?. proceeds to the right property. {a:1}?.a == 1
ø?:1 == 1
{a:1}?.a == 1
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