Ruby Cheat Sheet printable pdf download

Ruby Cheat Sheet

Ruby monstas Ruby cheat sheet, Part 3

Blocks

Name

Description

Structure

Examples

5 . t i m e s d o | i |

times

Iterates the given block int times, passing in values from

number.times do |i|

p u t s i

zero to int 1.

code

e n d

end

5 . t i m e s d o

numbers.times do

p u t s “ H e l l o w o r l d ! ”

code

e n d

end

n u m b e r s . c o l l e c t d o | n u m b e r |

collect

Creates a new array containing the values returned by the

array.collection do |value|

n u m b e r + 1

block.

code

e n d

end

n u m b e r s . s e l e c t d o | n u m b e r |

select

Returns a new array containing all elements of the array

array.select do |value|

n u m b e r . o d d ?

for which the given block returns a true value.

return boolean expression

e n d

end

n u m b e r s . d e t e c t d o | n u m b e r |

detect

Passes each entry in enum to block. Returns the first for

array.detect do |value|

n u m b e r . e v e n ?

which block is not false. If no object matches then it

return boolean expression

e n d

returns nil.

end

Ruby Cheat Sheet

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