Swift Arrays: Real-Life Examples
Swift Arrays: Real-Life Examples
Arrays are everywhere: rendering lists, aggregating values, finding items, and transforming data.
Aggregate and Transform
Use filter, map, and reduce to process arrays declaratively.
Example
let scores = [72, 88, 95, 64, 83]
let passed = scores.filter { $0 >= 75 }
let curved = passed.map { $0 + 5 }
let average = curved.reduce(0, +) / curved.count
print(passed)
print(curved)
print("Average: \(average)")Filter to keep passing scores, map to apply a curve, then reduce to compute an average.
Tip: Prefer declarative iteration for clarity and fewer bugs.
Search & Index
Check for membership and find the index of a value.
Example
let names = ["Kai", "Bjorn", "Stale"]
print(names.contains("Bjorn")) // true
if let i = names.firstIndex(of: "Stale") {
print(i) // 2
}
