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Current File : //opt/alt/ruby18/share/ri/1.8/system/Kernel/trace_var-i.yaml

--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Controls tracing of assignments to global variables. The parameter +symbol_ identifies the variable (as either a string name or a symbol identifier). <em>cmd</em> (which may be a string or a <tt>Proc</tt> object) or block is executed whenever the variable is assigned. The block or <tt>Proc</tt> object receives the variable's new value as a parameter. Also see <tt>Kernel::untrace_var</tt>.
- !ruby/struct:SM::Flow::VERB 
  body: "   trace_var :$_, proc {|v| puts &quot;$_ is now '#{v}'&quot; }\n   $_ = &quot;hello&quot;\n   $_ = ' there'\n"
- !ruby/struct:SM::Flow::P 
  body: <em>produces:</em>
- !ruby/struct:SM::Flow::VERB 
  body: "   $_ is now 'hello'\n   $_ is now ' there'\n"
full_name: Kernel#trace_var
is_singleton: false
name: trace_var
params: |
  trace_var(symbol, cmd )             => nil
  trace_var(symbol) {|val| block }    => nil

visibility: public