Ruby: Hashmap have value as function and its evaluating the function-CodePudding

I have a hashmap as below

func_hash = {
          "update" =>  update(),
          "delete" =>  delete(),
          "get" => get()
        }

The behaviour that I am observing is , while ruby trying to read this line, its also calling the function update().

How can I make it work like, call the function only when I call it with specific key like

func_hash["delete"]

Any help, much appreciated.

Thank you.

CodePudding user response：

you could do something like

func_hash = {
  "update" => lambda { update() },
  "delete" => lambda { delete() },
  "get" => lambda { get() }
}

func_hash["delete"].call

CodePudding user response：

Use a lambda like Ursus suggested to just store the name of the function in the hash and use public_send:

func_hash = {
  "update" => [:update],
  "delete" => [:delete],
  "get" => [:get],
  "complex" => [:method_name, 'argument', 'another_argument']
}

public_send(*func_hash['complex'])
#=> would call `method_name('argument', 'another_argument')`