How can the double question mark symbol "??" be used in ios Swift prog

1.	How can the double question mark symbol "??" be used in ios Swift programming?
Answer» The nil-coalescing operator "??" is a SHORTHAND for the ternary conditional operator, which we used to test for nil. A double question MARK can also be used to set a variable's default value. "default STRING" stringVar?? This does PRECISELY what you would EXPECT: if stringVar is not nil, it is returned; otherwise, the "default string" is returned.

How can the double question mark symbol "??" be used in ios Swift programming?

Answer»

The nil-coalescing operator "??" is a SHORTHAND for the ternary conditional operator, which we used to test for nil. A double question MARK can also be used to set a variable's default value.

"default STRING" stringVar??

This does PRECISELY what you would EXPECT: if stringVar is not nil, it is returned; otherwise, the "default string" is returned.

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How can the double question mark symbol "??" be used in ios Swift programming?

How can the double question mark symbol "??" be used in ios Swift programming?

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