tijani
831b333a74
Will take in a string a string and return the length of said string. This function only accepts one argument. This function only accepts strings. Any other type will result in an error. git-svn-id: https://svn.tlawal.org/svn/monkey@65 f6afcba9-9ef1-4bdd-9b72-7484f5705bac
21 lines
490 B
Go
21 lines
490 B
Go
package evaluator
|
|
|
|
import "monkey/object"
|
|
|
|
var builtins = map[string]*object.Builtin{
|
|
"len": &object.Builtin{
|
|
Fn: func(args ...object.Object) object.Object {
|
|
if len(args) != 1 {
|
|
return new_error("wrong number of arguments, got=%d, want=1", len(args))
|
|
}
|
|
|
|
switch arg := args[0].(type) {
|
|
case *object.String:
|
|
return &object.Integer{Value: int64(len(arg.Value))}
|
|
default:
|
|
return new_error("argument to `len` not supported, got %s", args[0].Type())
|
|
}
|
|
},
|
|
},
|
|
}
|