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Added function echo_n which does not print a newline after the arg. #408

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Added function echo_n which does not print a newline after the arg. #408

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23 changes: 23 additions & 0 deletions evaluator/functions.go
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,11 @@ func getFns() map[string]*object.Builtin {
Types: []string{},
Fn: echoFn,
},
// echo_n(arg:"hello")
"echo_n": &object.Builtin{
Types: []string{},
Fn: echo_nFn,
},
// int(string:"123")
// int(number:"123")
"int": &object.Builtin{
Expand Down Expand Up @@ -766,6 +771,24 @@ func echoFn(tok token.Token, env *object.Environment, args ...object.Object) obj
return NULL
}

// echo_n(arg:"hello")
func echo_nFn(tok token.Token, env *object.Environment, args ...object.Object) object.Object {
if len(args) == 0 {
// allow echo() without crashing
return NULL
}
var arguments []interface{} = make([]interface{}, len(args)-1)
for i, d := range args {
if i > 0 {
arguments[i-1] = d.Inspect()
}
}

fmt.Fprintf(env.Writer, args[0].Inspect(), arguments...)

return NULL
}

// int(string:"123")
// int(number:123)
func intFn(tok token.Token, env *object.Environment, args ...object.Object) object.Object {
Expand Down