ForNext
Only Do What Only You Can Do
091. is key present
Hyperpolyglot Interpreted Languages: Tcl, Lua, JavaScript, Io より (2012.05.08)
JavaScript
d.hasOwnProperty("t");
Lua
d["t"] ~= nil
Io
d hasKey("t")
d.hasOwnProperty("t");
d["t"] ~= nil
d hasKey("t")