Ruby splat and << operators -

i want this:

a << *b 

but happens in irb:

1.9.3p327 :020 >  => [1, 2, 3, 4]  1.9.3p327 :021 > b  => [5, 6, 7]  1.9.3p327 :022 > << *b syntaxerror: (irb):22: syntax error, unexpected tstar << *b       ^ 

am missing something?

look reason here :

 = [1, 2, 3, 4]   b = [5, 6, 7]   p a.<<(*b)  # ~> -:3:in `<<': wrong number of arguments (3 1) (argumenterror)  # ~>  -:3:in `<main>' 

<< method expects 1 argument.so below splat(*) operator,which create 5,6,7 ,which << method not expect,rather expects 1 object. design of ruby don't allowing * before b.

 = [1, 2, 3, 4]   b = [5, 6, 7]   p << *  # ~> -:3: syntax error, unexpected *   = [1, 2, 3, 4]   b = [5, 6, 7]   p << *b  # ~> -:3: syntax error, unexpected *  # ~> p << *b  # ~>         ^ 

that why 2 legitimate errors :

• wrong number of arguments (3 1) (argumenterror)

• syntax error, unexpected *

probably can use -

 = [1, 2, 3, 4]   b = [5, 6, 7]   p a.push(*b)  # >> [1, 2, 3, 4, 5, 6, 7]