함수 map()

map

1 JavaScript

var numbers = [1, 4, 9];
var roots = numbers.map(Math.sqrt);
// roots is now [1, 2, 3]
// numbers is still [1, 4, 9]

var numbers = [1, 5, 10, 15];
var doubles = numbers.map(function(x) {
   return x * 2;
});
// doubles is now [2, 10, 20, 30]
// numbers is still [1, 5, 10, 15]

2 Python

Python 3

numbers = [1, 2, 3, 4, 5, 6]
print( list(map(lambda x: x * 2 - 1, numbers)) )
# [1, 3, 5, 7, 9, 11]

numbers = [1, 2, 3, 4, 5, 6]
print( [x * 2 - 1 for x in numbers] )
# [1, 3, 5, 7, 9, 11]

3 같이 보기

• reduce
• filter
• lambda function
• list comprehension
• 맵리듀스 프로그래밍 모델