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package main | |
import "golang.org/x/tour/pic" | |
func Pic(dx, dy int) [][]uint8 { | |
z := make([][]uint8, dy) | |
for i := range z { | |
z[i] = make([]uint8, dx) | |
for j := range z[i]{ | |
z[i][j] = uint8(i^j+(i+j)/2) |
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class Post | |
end |
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class User | |
has_many :departments | |
def department_name | |
departaments.join(",") | |
end | |
end | |
def user_info(user) | |
"Name: #{user.name}. Dept: #{user.department_name}" |
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class User | |
delegate :name, to: :department, prefix: true, allow_nil: true | |
# ... | |
end | |
def user_info(user) | |
"Name: #{user.name}. Dept: #{user.department_name}" | |
end |
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def user_info(user) | |
"Name: #{user.name}. Dept: #{user.departments.map(&:name).join(",")}" | |
end |
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def user_info(user) | |
"Name: #{user.name}. Boss: #{user.department.try(:head).try(:name)}" | |
end |
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def user_info(user) | |
"Name: #{user.name}. Dept: #{user.department.try(:name)}" | |
end | |
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class PostDecorator | |
attr_reader :post | |
def initialize post | |
@post = post | |
end | |
def is_recent? | |
published_at > 2.days.ago | |
end |
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- if @post_decorator.recent? | |
= image_tag(@post_decorator.image) | |
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class PostDecorator | |
attr_reader :post | |
def initialize post | |
@post = post | |
end | |
def recent? | |
published_at > 2.days.ago | |
end |