# Syntax and values

- [!= — inequality](not-equal.md)
- [% — remainder](remainder.md)
- [* — multiplication](multiply.md)
- [+ — addition and concatenation](add.md)
- [- — subtraction](subtract.md)
- [/ — division](divide.md)
- [< — less than](less.md)
- [<= — less than or equal to](less-equal.md)
- [= — initialization and assignment](assignment-sign.md)
- [== — equality](equal.md)
- [> — greater than](greater.md)
- [>= — greater than or equal to](greater-equal.md)
- [and: when both conditions must be true](and.md)
- [Grouping instructions in blocks](blocks.md)
- [Boolean: true or false](boolean.md)
- [Braces: map literals](braces.md)
- [Changing a value inside nested collections](chained-assignment.md)
- [Functions inside functions](closures.md)
- [Sharing and copying lists and maps](collection-sharing.md)
- [Colon: block headers and map entries](colon.md)
- [Comma: separators and trailing commas](comma.md)
- [Comments: #](comments.md)
- [The complete grammar: how Pliro fits together](grammar.md)
- [else: what happens otherwise](else.md)
- [Working out a value: expressions](expressions.md)
- [false — the Boolean false literal](false.md)
- [for: visiting each item](for.md)
- [Using a function: calls and arguments](calls.md)
- [function: naming a reusable job](function.md)
- [Choosing names and recognizing keywords](identifiers.md)
- [if: making a choice](if.md)
- [in — separate loop name and iterable](in.md)
- [Indexing with []](indexing.md)
- [let: giving a value a name](let.md)
- [Where can I use my variable?](scope.md)
- [List: keeping items in order](list.md)
- [Map: looking up values by a key](map.md)
- [Using a dot to find a named value](member-access.md)
- [none: when there is no value](none.md)
- [not: reversing a true-or-false answer](not.md)
- [Number and number literals](number.md)
- [or: when at least one condition must be true](or.md)
- [Parentheses: grouping and calls](parentheses.md)
- [A function that calls itself](recursion.md)
- [return: sending an answer back](return.md)
- [set: changing an existing value](set.md)
- [Source files and projects](source-files.md)
- [Source-language directive](locale.md)
- [Square brackets: lists and indexing](square-brackets.md)
- [Text and string literals](text.md)
- [Different kinds of values](types.md)
- [true — the Boolean true literal](true.md)
- [Unary + — numeric identity](unary-plus.md)
- [Unary - — numeric negation](unary-minus.md)
- [Unsupported and reserved syntax](unsupported.md)
- [use — import a project module](use.md)
- [How Pliro stores text files](encoding.md)
- [when — cooperative event scripts](when.md)
- [while: repeating while a condition is true](while.md)
- [Whitespace and indentation](indentation.md)