What are the higher order functions in swift?

825

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What mechanism does ios support for multi-threading?

768

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How to add an element into an array?

820

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Explain some common features of protocols & superclasses.

906

---

What is optional chaining?

808

---

What is a guard statement?

831

---

Who calls the main function of our app during the app launch cycle?

878

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What is the benefit of using guard statement in swift?

829

---

Explain some biggest changes in usernotifications.

845

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What is “defer”?

845

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What are ui elements?

801

---

What is the difference between array and nsarray?

911

---

What are the most important features of swift?

839

---

What are the different ways to pass data in swift?

790

---

What is the use of double question mark “??” In swift?

874

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