What is swift nsarray?

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How would you define variables and constants in swift programming language?

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What is swift in ios?

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How to add an element into an array?

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struct Planet { var name: String var distanceFromSun: Double } let planets = [ Planet(name: "Mercury", distanceFromSun: 0.387), Planet(name: "Venus", distanceFromSun: 0.722), Planet(name: "Earth", distanceFromSun: 1.0), Planet(name: "Mars", distanceFromSun: 1.52), Planet(name: "Jupiter", distanceFromSun: 5.20), Planet(name: "Saturn", distanceFromSun: 9.58), Planet(name: "Uranus", distanceFromSun: 19.2), Planet(name: "Neptune", distanceFromSun: 30.1) ] let result1 = planets.map { $0.name } let result2 = planets.reduce(0) { $0 + $1.distanceFromSun } What are the types and values of the result1 and result2 variables? Explain why.

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Does swift have header files?

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What is closure in swift?

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Is swift pass by reference?

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How you define variables in swift language?

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Can you make a property optional?

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In swift what is use of backticks while declaring a variable?

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What is reuseidentifier in swift?

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