What are the higher order functions in swift?

833

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What mechanism does ios support for multi-threading?

773

---

How to add an element into an array?

827

---

Explain some common features of protocols & superclasses.

909

---

What is optional chaining?

817

---

What is a guard statement?

837

---

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

880

---

What is the benefit of using guard statement in swift?

837

---

Explain some biggest changes in usernotifications.

854

---

What is “defer”?

851

---

What are ui elements?

813

---

What is the difference between array and nsarray?

917

---

What are the most important features of swift?

846

---

What are the different ways to pass data in swift?

797

---

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

884

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