함수 map()

map()

1 JavaScript[ | ]

JavaScript .map() 문서를 참고하십시오.

JavaScript

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

▶	[1, 2, 3]
▶	[1, 4, 9]

JavaScript

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

▶	[2, 10, 20, 30]
▶	[1, 5, 10, 15]

2 PHP[ | ]

PHP array_map() 문서를 참고하십시오.

PHP

CPU

0.0s

MEM

22M

0.0s

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$a = [2, 3, 4];
$b = array_map( function($n) { return $n*$n; }, $a);
print_r( $b );

Array
(
    [0] => 4
    [1] => 9
    [2] => 16
)

3 Python[ | ]

Python

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

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Python

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

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4 Perl[ | ]

Perl

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my @numbers = (1, 2, 3, 4, 5, 6);
print map { $_* 2 - 1 } @numbers; # 1357911

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5 R[ | ]

R sapply() 문서를 참고하십시오.

R

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sapply(c(2,3,4), function(n) { n*n }) ## [1]  4  9 16

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6 같이 보기[ | ]