is
Function
is — test a value’s type
Synopsis
is(val: any, t: type) -> bool
Description
The is function returns true if the argument val is of type t.
The is function is shorthand for typeof(val)==t.
Examples
Test simple types:
values {yes:is(this, <float64>),no:is(this, <int64>)}1.Loading...echo '1.' \
| super -s -c 'values {yes:is(this, <float64>),no:is(this, <int64>)}' -Test for a given input’s record type or “shape”:
values is(this, <{s:string}>){s:"hello"}Loading...echo '{s:"hello"}' \
| super -s -c 'values is(this, <{s:string}>)' -If you test a named type with its underlying type, the types are different, but if you use the type name or typeof and under functions, there is a match:
values is(this, <{s:string}>){s:"hello"}::=fooLoading...echo '{s:"hello"}::=foo' \
| super -s -c 'values is(this, <{s:string}>)' -values is(this, <foo>){s:"hello"}::=fooLoading...echo '{s:"hello"}::=foo' \
| super -s -c 'values is(this, <foo>)' -To test the underlying type, just use ==:
values under(typeof(this))==<{s:string}>{s:"hello"}::=fooLoading...echo '{s:"hello"}::=foo' \
| super -s -c 'values under(typeof(this))==<{s:string}>' -