smuuf/primi

//
// f-strings.
//

//
// Simple f-strings with a single expression.
//

a = 1
assert(f"x{a}y" == "x1y")

a = 'hello there'
assert(f"x{a}y" == "xhello therey")

a = false
assert(f"x{a}y" == "xfalsey")

a = null
assert(f"x{a}y" == "xnully")

a = {}
assert(f"x{a}x" == "x{}x")

//
// How to put literal { or } in f-strings.
//
single_braces = "<this is an f-string>"
assert(f"X {{double curly-braces make literal braces}} vs {single_braces} Y" == "X {double curly-braces make literal braces} vs <this is an f-string> Y")

//
// f-strings with multiple expressions.
//

a = 1
b = 'XXX'
c = [9, 8, 7, {'a': 'A'}]

assert('1|XXX|[9, 8, 7, {"a": "A"}]' == f"{a}|{b}|{c}")

//
// Using undefined variable in f-string raises error.
//

try {
    print(f"{undefined_var}");
    raised_error = 0
} catch {
    raised_error = 1
}
assert(raised_error == 1)