Test for a child
lib callCapy
has(value : dval, key : string) bool
Description
has(value, key) tests for a child without creating it. It returns false for a missing key or a scalar.
Parameters
value : value to test
key : child key
Return Values
true when the key exists.
Example
Capy
var user := dval({"name": "Ada"})
print(has(user, "name"), " ", has(user, "age"), "\n")