What are the higher order functions in swift?

870

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What mechanism does ios support for multi-threading?

829

---

How to add an element into an array?

865

---

Explain some common features of protocols & superclasses.

975

---

What is optional chaining?

861

---

What is a guard statement?

880

---

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

919

---

What is the benefit of using guard statement in swift?

882

---

Explain some biggest changes in usernotifications.

900

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What is “defer”?

895

---

What are ui elements?

860

---

What is the difference between array and nsarray?

958

---

What are the most important features of swift?

888

---

What are the different ways to pass data in swift?

838

---

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

921

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