Core keywords

89 slots, each with its own page and JSON declaration. See how this reference is built.

Slot	Description
add	Appends source nodes to selected destination containers.
and	Returns true if all children evaluate to true.
apply	Stamps a template lambda with values from child argument nodes, producing one fully-substituted output per [.dp].
case	Evaluates a single case branch inside [switch].
compose	Builds an expression at runtime by concatenating the evaluated child node values; useful for dynamic node selection.
context	Creates a named stack context object retrievable with [get-context] while evaluating a lambda block.
convert	Coerces a value to a different CLR type; useful for parsing strings into numbers, dates, booleans, or other strongly-typed values.
csv2lambda	Transforms CSV into a lambda hierarchy.
default	Evaluates the default branch inside [switch].
else	Evaluates its child lambda when every preceding [if] and [else-if] condition was false.
else-if	Evaluates the child lambda when its condition is true and no preceding [if]/[else-if] branch matched.
eq	Returns true if two operands are equal.
eval	Executes a lambda block; use it to run a node tree dynamically or to scope a group of statements.
execute	Invokes a dynamic slot after unwrapping descendant expressions.
execute-file	Loads a Hyperlambda file and evaluates it as if it were inlined; child nodes become its [.arguments].
exists	Returns true if the specified node or expression exists.
filter	Filters selected nodes using the child lambda as a predicate.
floatArray2bytes	Serializes a sequence of float values into raw bytes; useful for embedding vectors or feeding binary APIs.
for-each	Iterates over the nodes matching the expression and evaluates the child lambda once per node as [.dp].
fork	Spawns a fire-and-forget background thread that evaluates the child lambda; the parent continues immediately.
format	Formats a value using a .NET format string and optional culture; useful for currencies, dates, and number rendering.
get-context	Returns a stack value or context object from the current execution context.
get-count	Returns the number of matching nodes.
get-first-value	Returns the first non-null value produced by candidate child nodes.
get-name	Returns the name of the first matching node.
get-nodes	Returns clones of every node matching the expression as children of the current node.
get-value	Returns the value of the first matching node.
html-decode	HTML decodes the specified string.
html2lambda	Transforms HTML into a lambda hierarchy.
html2markdown	Transforms HTML into Markdown.
html2pdf	Converts HTML into a PDF document.
hyper2lambda	Transforms Hyperlambda into a lambda hierarchy.
if	Evaluates the child lambda only if the condition is true; chain with [else-if] and [else] for additional branches.
include	Evaluates child slots and includes all returned nodes into each selected node.
insert-after	Inserts nodes after the specified target node.
insert-before	Inserts nodes before the specified target node.
int2words	Spells an integer out in English words (e.g. 557 becomes ‘five hundred and fifty seven’); handy for invoices and cheques.
invoke	Invokes a lambda expression as a callable slot.
join	Waits for one or more child [fork] operations to finish before proceeding.
json2lambda	Transforms JSON into a lambda hierarchy.
json2lambda-stream	Transforms JSON stream content into a lambda hierarchy.
json2yaml	Transforms JSON into YAML.
lambda2csv	Transforms a lambda hierarchy into CSV.
lambda2html	Transforms a lambda hierarchy into HTML.
lambda2hyper	Transforms a lambda hierarchy into Hyperlambda.
lambda2json	Transforms a lambda hierarchy into JSON.
lambda2xml	Converts a lambda object to an XML fragment or document.
lambda2yaml	Transforms a lambda hierarchy into YAML.
lt	Returns true if the first operand is less than the second operand.
lte	Returns true if the first operand is less than or equal to the second operand.
map	Maps selected nodes into a new result set using the child lambda.
markdown2html	Transforms Markdown into HTML.
mt	Returns true if the first operand is greater than the second operand.
mte	Returns true if the first operand is greater than or equal to the second operand.
neq	Returns true if two operands are not equal.
not	Negates a boolean expression.
not-exists	Returns true if the specified node or expression does not exist.
not-null	Returns true if the specified node or expression is not null.
null	Returns true if the specified node or expression is null.
or	Returns true if any child expression evaluates to true.
pdf2text	Extracts text from a PDF file or stream.
reference	Returns the first matched node as a live reference so callers can mutate it in place rather than copy its value.
remove-nodes	Removes nodes from the lambda graph.
return	Returns a value, expression result, or child nodes to the nearest caller.
return-nodes	Returns child nodes or evaluated nodes to the nearest caller.
return-value	Returns a value to the caller.
semaphore	Serializes access to a critical section by name; only one thread at a time can enter a given semaphore.
set-name	Sets the name of matching nodes.
set-value	Sets node values in the lambda graph.
set-x	Sets node values without evaluating expressions in the source.
signal	Invokes a dynamic slot created with [slots.create], passing child nodes as its arguments.
sleep	Delays execution for the specified number of milliseconds.
sort	Sorts selected nodes using the child lambda as a comparer.
switch	Evaluates one of several branches based on the input value.
throw	Aborts execution by throwing an exception with the given message; optionally attach status code and public flag.
time	Constructs a TimeSpan value from child nodes.
try	Evaluates the protected body; pair with [.catch] to handle exceptions and/or [.finally] to always run cleanup.
try-signal	Invokes a dynamic slot if it exists and ignores missing slots.
type	Returns the CLR type name of a value.
types	Lists every CLR type name recognized by Hyperlambda; useful when [convert] or [type] needs a valid target.
unwrap	Forward-evaluates expression values on the selected nodes, replacing them with their resolved values; commonly used before [signal] or [add].
version	Returns the Magic Cloud version to the caller.
vocabulary	Lists available compiled slots.
while	Repeats execution while a condition is true.
whitelist	Evaluates a lambda with a restricted whitelist of allowed slots.
xml2lambda	Transforms XML into a lambda hierarchy.
yaml2json	Transforms YAML into JSON.
yaml2lambda	Transforms YAML into a lambda hierarchy.
yield	Returns multiple child nodes or evaluated nodes to the caller.