Control Flow

Indentation, not braces

A block is : followed by either an indented group of statements, or (for short bodies) a single statement on the same line. The lexer tracks indentation itself and hands the parser clean INDENT/DEDENT tokens — see Indentation-Sensitive Lexing for exactly how, if you’re curious about the mechanism.

Typing {, }, or ; doesn’t just fail silently or fall through to a generic parse error — the lexer recognizes them and raises a specific message pointing at the replacement (“Sense uses indentation for blocks, not { }…”). This matters more than it sounds: it’s aimed squarely at people (and LLMs) whose muscle memory defaults to C-family syntax.

`if` / `else`

if x > 10:
    print("big")
else if x > 0:
    print("small positive")
else:
    print("non-positive")

else if chains parse as nested if statements in the AST (the same representation you’d get writing it as nested if/else blocks by hand) — there’s no special “elif” token.

`while`

i = 0
while i < 3:
    print(i)
    i = i + 1

`for` — over arrays and strings

for user in ["alice", "bob", "carol"]:
    print("notifying " + user)

for ch in "abc":
    print(ch)

range(a), range(a, b), and range(a, b, step) build an Array<Int> you can iterate the same way:

total = 0
for n in range(1, 6):
    total = total + n
print(total)   # 15

`break` / `continue`

for user in ["alice", "bob", "carol", "dave"]:
    if user == "carol":
        continue
    if user == "dave":
        break
    print("notifying " + user)

notifying alice
notifying bob

Multi-line expressions

Newlines and indentation are both suppressed inside ( ) and [ ], so a call or array literal can wrap across lines without any continuation character:

print(
    "a",
    "b",
)

xs = [
    1,
    2,
    3,
]

Continue

Arrays

Literals, indexing, mutation, and the built-in helpers.

Modules

Splitting a program across files with import.

Language

AI-Native

Safety

Control Flow

Indentation, not braces

`if` / `else`

`while`

`for` — over arrays and strings

`break` / `continue`

Multi-line expressions

Continue

Arrays

Modules

​Indentation, not braces

​if / else

​while

​for — over arrays and strings

​break / continue

​Multi-line expressions

​Continue

Arrays

Modules

Indentation, not braces

`if` / `else`

`while`

`for` — over arrays and strings

`break` / `continue`

Multi-line expressions

Continue