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"함수 map()"의 두 판 사이의 차이

 
(사용자 2명의 중간 판 10개는 보이지 않습니다)
1번째 줄: 1번째 줄:
;map
[[분류: map()]]
;map()


==JavaScript==
==JavaScript==
{{참고|JavaScript .map()}}
{{참고|JavaScript .map()}}
[[category: JavaScript]]
[[category: JavaScript]]
<source lang='JavaScript'>
<syntaxhighlight lang='JavaScript' run>
var numbers = [1, 4, 9];
var numbers = [1, 4, 9];
var roots = numbers.map(Math.sqrt);
var roots = numbers.map(Math.sqrt);
// roots is now [1, 2, 3]
console.log( roots );  // roots is now [1, 2, 3]
// numbers is still [1, 4, 9]
console.log( numbers ); // numbers is still [1, 4, 9]
</source>
</syntaxhighlight>
<source lang='JavaScript'>
<syntaxhighlight lang='JavaScript' run>
var numbers = [1, 5, 10, 15];
var numbers = [1, 5, 10, 15];
var doubles = numbers.map(function(x) {
var doubles = numbers.map(function(x) {
   return x * 2;
   return x * 2;
});
});
// doubles is now [2, 10, 20, 30]
console.log( doubles ); // doubles is now [2, 10, 20, 30]
// numbers is still [1, 5, 10, 15]
console.log( numbers ); // numbers is still [1, 5, 10, 15]
</source>
</syntaxhighlight>


==PHP==
==PHP==
[[category: PHP]]
[[category: PHP]]
{{참고|PHP array_map()}}
{{참고|PHP array_map()}}
<source lang='php'>
<syntaxhighlight lang='php' run>
$a = [2, 3, 4];
$a = [2, 3, 4];
$b = array_map( function($n) { return $n*$n; }, $a);
$b = array_map( function($n) { return $n*$n; }, $a);
print_r( $b );
print_r( $b );
# Array
</syntaxhighlight>
# (
#    [0] => 4
#    [1] => 9
#    [2] => 16
# )
</source>


==Python==
==Python==
[[category: Python]]
[[category: Python]]
;Python 3
<syntaxhighlight lang='Python' run>
<source lang='Python'>
numbers = [1, 2, 3, 4, 5, 6]
numbers = [1, 2, 3, 4, 5, 6]
print( list(map(lambda x: x * 2 - 1, numbers)) )
print( list(map(lambda x: x * 2 - 1, numbers)) ) # [1, 3, 5, 7, 9, 11]
# [1, 3, 5, 7, 9, 11]
</syntaxhighlight>
</source>
<syntaxhighlight lang='Python' run>
<source lang='Python'>
numbers = [1, 2, 3, 4, 5, 6]
numbers = [1, 2, 3, 4, 5, 6]
print( [x * 2 - 1 for x in numbers] )
print( [x * 2 - 1 for x in numbers] ) # [1, 3, 5, 7, 9, 11]
# [1, 3, 5, 7, 9, 11]
</syntaxhighlight>
</source>


==Perl==
==Perl==
[[category: Perl]]
[[category: Perl]]
<source lang='Perl'>
<syntaxhighlight lang='Perl' run>
my @numbers = (1, 2, 3, 4, 5, 6);
my @numbers = (1, 2, 3, 4, 5, 6);
print map { $_* 2 - 1 } @numbers;
print map { $_* 2 - 1 } @numbers; # 1357911
# 1357911
</syntaxhighlight>
</source>
 
==R==
[[분류: R]]
{{참고|R sapply()}}
<syntaxhighlight lang='r' run>
sapply(c(2,3,4), function(n) { n*n }) ## [1]  4  9 16
</syntaxhighlight>


==같이 보기==
==같이 보기==

2022년 4월 19일 (화) 11:40 기준 최신판

map()

1 JavaScript[ | ]

JavaScript .map() 문서를 참고하십시오.
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]

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 PHP[ | ]

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

3 Python[ | ]

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]

4 Perl[ | ]

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

5 R[ | ]

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

6 같이 보기[ | ]

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