What are the higher order functions in swift?

786

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What mechanism does ios support for multi-threading?

723

---

How to add an element into an array?

770

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Explain some common features of protocols & superclasses.

861

---

What is optional chaining?

757

---

What is a guard statement?

785

---

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

832

---

What is the benefit of using guard statement in swift?

780

---

Explain some biggest changes in usernotifications.

799

---

What is “defer”?

794

---

What are ui elements?

754

---

What is the difference between array and nsarray?

856

---

What are the most important features of swift?

790

---

What are the different ways to pass data in swift?

754

---

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

819

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