Basics

a = {"one" => "111"}
a.each_key {|key| if key == "one" then puts a.fetch(key) end}

How to set it up

b = {
  1 => Proc.new do
    resize
    end,
  2 =>
    Proc.new do
    resize
    end,
  "one" => "111"
}

Another way to set up your hash:

hash = {}
hash["key"] = "value"

Duplicating a value:

hash = {}
hash["key"] = "value"
hash["duplicate"] = hash["key"]

Another way:

c = {
1 => "one",
}
d = {
2 => c[1],
}
c.merge!(d)

Another way to add to an existing hash:

a = { 1 => "one" }
a.merge!({ 2 => "two" })

Calculate something as the key.

e_2 = 2
e = {
1 => "one",
e_2 => "two",
}

Generate the key intelligently:

f_2 = true
f = {
(if f_2 == true then 1 end) => "one",
}

g_1 = false
g = {
(if g_1 == true then 1 else 2 end) => "test",
}

h_1 = true
h_2 = true
h = {
(if h_1 == true then 1 else nil end) => (if h_2 == true then "one" else nil end),
2 => "two"
}

Resources ∞

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