Number of occurrences of substring in string in Swift

Question

My main string is \"hello Swift Swift and Swift\" and substring is Swift. I need to get the number of times the substring \"Swift\" occurs in the mentioned string.

T

Answer 1

Solution which uses a higher order functions

func subStringCount(str: String, substr: String) -> Int {
    { $0.isEmpty ? 0 : $0.count - 1 } ( str.components(separatedBy: substr))
}

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Unit Tests

import XCTest

    class HigherOrderFunctions: XCTestCase {

        func testSubstringWhichIsPresentInString() {
            XCTAssertEqual(subStringCount(str: "hello Swift Swift and Swift", substr: "Swift"), 3)
        }

        func testSubstringWhichIsNotPresentInString() {
            XCTAssertEqual(subStringCount(str: "hello", substr: "Swift"), 0)
        }

    }