What is difference between 'let' and 'var' declaration ?

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What is set swift?

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what are functions different from methods?

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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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What is forced unwrapping? Why is it potentially unsafe?

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What is the difference between function and method in swift?

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Why we use delegates in swift?

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Explain any three-shift pattern matching techniques?

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Is swift object oriented programming?

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What is nil in swift?

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What are the various ways to unwrap an optional in swift?

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How long does it take to learn swift?

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