rxjs map code example

Example 1: rxswift map

func transformUsingMap() -> Observable<String> {
    return Observable.of(1, 2, 3)
        .map { String("\($0)") }
}

func arrayToNewObject(items: [Item]) -> [Data] {
   return items.map({ item in 
                   return Data(item)
       })
}

Example 2: javascript map

const myArray = ['Sam', 'Alice', 'Nick', 'Matt'];

// Appends text to each element of the array
const newArray = myArray.map(name => {
	return 'My name is ' + name; 
});
console.log(newArray); // ['My name is Sam', 'My Name is Alice', ...]

// Appends the index of each element with it's value
const anotherArray = myArray.map((value, index) => index + ": " + value);
console.log(anotherArray); // ['0: Sam', '1: Alice', '2: Nick', ...]

// Starting array is unchanged
console.log(myArray); // ['Sam', 'Alice', 'Nick', 'Matt']