# Built-in functions
A built-in function is a function of the script context.
# Account data storage functions
| Name | Description | Complexity |
|---|---|---|
| assetBalancе(Address|Alias, ByteVector): Int | Gets account balance by token ID | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getBinary(Address|Alias, String): ByteVector|Unit | Gets an array of bytes by key | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getBinaryValue(Address|Alias, String): ByteVector | Gets an array of bytes by key. Throws an exception if there is no data | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getBoolean(Address|Alias, String): Boolean|Unit | Gets a boolean value by key | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getBooleanValue(Address|Alias, String): Boolean | Gets a boolean value by key. Throws an exception if there is no data | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getInteger(Address|Alias, String): Int|Unit | Gets an integer by key | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getIntegerValue(Address|Alias, String): Int | Gets an integer by key. Throws an exception if there is no data | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getString(Address|Alias, String): String|Unit | Gets a string by key | 100 for Standard Library version 3 10 for Standard Library version 4 |
| getStringValue(Address|Alias, String): String | Gets a string by key. Throws an exception if there is no data | 100 for Standard Library version 3 10 for Standard Library version 4 |
| wavesBalance(Address|Alias): Int | Gets account balance in WAVES | 100 for Standard Library version 3 10 for Standard Library version 4 |
# Blockchain functions
| Name | Description | Complexity |
|---|---|---|
| assetInfo(ByteVector): Аsset|Unit | Gets the information about a token | 100 for Standard Library version 3 15 for Standard Library version 4 |
| blockInfoByHeight(Int): BlockInfo |Unit | Gets the information about a block by the block height | 100 for Standard Library version 3 5 for Standard Library version 4 |
| calculateAssetId(Issue): ByteVector | Calculates the ID of the asset, created by Issue structure during invoke script transaction execution | 10 |
| transactionHeightById(ByteVector): Int|Unit | Gets the block height of a transaction | 100 for Standard Library version 3 20 for Standard Library version 4 |
| transferTransactionById(ByteVector): TransferTransaction|Unit | Gets the data of a transfer transaction | 100 for Standard Library version 3 60 for Standard Library version 4 |
# Byte array functions
| Name | Description | Complexity |
|---|---|---|
| drop(ByteVector, Int): ByteVector | Returns the byte array without the first N bytes | 1 for Standard Library version 3 6 for Standard Library version 4 |
| dropRight(ByteVector, Int): ByteVector | Returns the byte array without the last N bytes | 19 for Standard Library version 3 6 for Standard Library version 4 |
| size(ByteVector): Int | Returns the number of bytes in the byte array | 1 |
| take(ByteVector, Int): ByteVector | Returns the first N bytes of the byte array | 1 for Standard Library version 3 6 for Standard Library version 4 |
| takeRight(ByteVector, Int): ByteVector | Returns the last N bytes of the byte array | 19 for Standard Library version 3 6 for Standard Library version 4 |
# Converting functions
| Name | Description | Complexity |
|---|---|---|
| addressFromPublicKey(ByteVector): Address | Converts account public key to address | 82 for Standard Library version 3 63 for Standard Library version 4 |
| addressFromRecipient(Address|Alias): Address | Gets the corresponding address of the alias | 100 for Standard Library version 3 5 for Standard Library version 4 |
| parseInt(String): Int|Unit | Converts the string representation of a number to its integer equivalent | 20 for Standard Library version 3 2 for Standard Library version 4 |
| parseIntValue(String): Int | Converts the string representation of a number to its integer equivalent.Raises an exception if the string cannot be parsed | 20 for Standard Library version 3 2 for Standard Library version 4 |
| toBytes(Boolean): ByteVector | Converts a boolean to an array of bytes | 1 |
| toBytes(Int): ByteVector | Converts an integer to an array of bytes | 1 |
| toBytes(String): ByteVector | Converts a string to an array of bytes | 1 for Standard Library version 3 8 for Standard Library version 4 |
| toInt(ByteVector): Int | Converts an array of bytes to an integer | 10 for Standard Library version 3 1 for Standard Library version 4 |
| toInt(ByteVector, Int): Int | Converts an array of bytes to an integer starting from a certain index | 10 for Standard Library version 3 1 for Standard Library version 4 |
| toString(Address): String | Converts an address to a string | 10 |
| toString(Boolean): String | Converts a boolean to a string | 1 |
| toString(Int): String | Converts an integer to a string | 1 |
| toUtf8String(ByteVector): String | Converts an array of bytes to a UTF-8 string | 20 for Standard Library version 3 7 for Standard Library version 4 |
| transferTransactionFromProto(ByteVector): TransferTransaction|Unit | Deserializes transfer transaction | 5 |
# Data transaction functions
| Name | Description | Complexity |
|---|---|---|
| getInteger(List[DataEntry], String): Int|Unit | Gets an integer value from a list of data entires by key | 10 |
| getInteger(List[DataEntry], Int): Int|Unit | Gets an integer value from a list of data entires by index | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getIntegerValue(List[DataEntry], String): Int | Gets an integer value from a list of data entires by key. Throws an exception if there is no data | 10 |
| getIntegerValue(List[DataEntry], Int): Int | Gets an integer value from a list of data entires by index. Throws an exception if there is no data | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getBoolean(List[DataEntry], String): Boolean|Unit | Gets a boolean value from a list of data entires by key | 10 |
| getBoolean(List[DataEntry], Int): Boolean|Unit | Gets a boolean value from a list of data entires by index | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getBooleanValue(List[DataEntry], String): Boolean | Gets a boolean value from a list of data entires by key. Throws an exception if there is no data | 10 |
| getBooleanValue(List[DataEntry], Int): Boolean | Gets a boolean value from a list of data entires by index. Throws an exception if there is no data | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getBinary(List[DataEntry], String): ByteVector|Unit | Gets a binary value from a list of data entires by key | 10 |
| getBinary(List[DataEntry], Int): ByteVector|Unit | Gets a binary value from a list of data entires by index | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getBinaryValue(List[DataEntry], String): ByteVector | Gets a binary value from a list of data entires by key. Throws an exception if there is no data | 10 |
| getBinaryValue(List[DataEntry], Int): ByteVector | Gets a binary value from a list of data entires by index. Throws an exception if there is no data | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getString(List[DataEntry] String): String|Unit | Gets a string value from a list of data entires by key | 10 |
| getString(List[DataEntry], Int): String|Unit | Gets a string value from a list of data entires by index | 30 for Standard Library version 3 4 for Standard Library version 4 |
| getStringValue(List[DataEntry], String): String | Gets a string value from a list of data entires by key. Throws an exception if there is no data | 10 |
| getStringValue(List[DataEntry], Int): String | Gets a string value from a list of data entires by index. Throws an exception if there is no data | 30 for Standard Library version 3 4 for Standard Library version 4 |
# Decoding functions
| Name | Description | Complexity |
|---|---|---|
| addressFromString(String): Address|Unit | Decodes address from base58 string | 124 for Standard Library version 3 1 for Standard Library version 4 |
| addressFromStringValue(String): Address | Decodes address from base58 string. Raises an exception if the address cannot be decoded | 124 for Standard Library version 3 1 for Standard Library version 4 |
| fromBase16String(String): ByteVector | Decodes base16 string to an array of bytes | 10 |
| fromBase58String(String): ByteVector | Decodes base58 string to an array of bytes | 10 for Standard Library version 3 1 for Standard Library version 4 |
| fromBase64String(String): ByteVector | Decodes base64 string to an array of bytes | 10 for Standard Library version 3 40 for Standard Library version 4 |
# Encoding functions
| Name | Description | Complexity |
|---|---|---|
| toBase16String(ByteVector): String | Encodes array of bytes to base16 string | 10 |
| toBase58String(ByteVector): String | Encodes array of bytes to base58 string | 10 for Standard Library version 3 3 for Standard Library version 4 |
| toBase64String(ByteVector): String | Encodes array of bytes to base64 string | 10 for Standard Library version 3 35 for Standard Library version 4 |
# Exception functions
| Name | Description | Complexity |
|---|---|---|
| throw() | Raises an exception | 1 |
| throw(String) | Raises an exception with a message | 1 |
# Hashing functions
| Name | Description | Complexity |
|---|---|---|
| blake2b256(ByteVector): ByteVector | Range of functions. Hash an array of bytes using BLAKE2b-256 | 10 for Standard Library version 3 10–200 for Standard Library version 4 |
| keccak256(ByteVector): ByteVector | Range of functions. Hash an array of bytes using Keccak-256 | 10 for Standard Library version 3 10–200 for Standard Library version 4 |
| sha256(ByteVector): ByteVector | Range of functions. Hash an array of bytes using SHA-256 | 10 for Standard Library version 3 10–200 for Standard Library version 4 |
# List functions
| Name | Description | Complexity |
|---|---|---|
| cons(T, List[T]): List[T] | Inserts element to the beginning of the list | 2 for Standard Library version 3 1 for Standard Library version 4 |
| containsElement(list: List[T], element: T): Boolean | Check if the element is in the list | 5 |
| getElement(List[T], Int): T | Gets element from the list | 2 |
| indexOf(list: List[T], element: T): Int|Unit | Returns the index of the first occurrence of the element in the list | 5 |
| lastIndexOf(list: List[T], element: T): Int|Unit | Returns the index of the last occurrence of the element in the list | 5 |
| max(List[Int]): Int | Returns the largest element in the list | 3 |
| min(List[Int]): Int | Returns the smallest item in the list | 3 |
| removeByIndex(list: List[T], index: Int): List[T] | Removes an element from the list by index | 7 |
| size(List[T]): Int | Returns the size of the list | 2 |
T is a short designation for Boolean|ByteVector|Int|String.
# Math functions
| Name | Description | Complexity |
|---|---|---|
| fraction(Int, Int, Int): Int | Multiplies and divides an integer to avoid the integer overflow | 1 |
| log(Int, Int, Int, Int, Int, Union): Int | Calculates logarithm of the number | 100 |
| median(List[Int]): Int | Returns the median of a list of integers | 20 |
| pow(Int, Int, Int, Int, Int, Union): Int | Raises the number to a power | 100 |
# String functions
| Name | Description | Complexity |
|---|---|---|
| contains(String, String): Boolean | Checks whether the string contains substring | 3 |
| drop(String, Int): String | Drops the first n characters of a string | 1 for Standard Library version 3 20 for Standard Library version 4 |
| dropRight(String, Int): String | Drops the last n characters of a string | 19 for Standard Library version 3 20 for Standard Library version 4 |
| indexOf(String, String): Int|Unit | Returns the index of the first occurrence of a substring | 20 for Standard Library version 3 3 for Standard Library version 4 |
| indexOf(String, String, Int): Int|Unit | Returns the index of the first occurrence of a substring after a certain index | 20 for Standard Library version 3 3 for Standard Library version 4 |
| lastIndexOf(String, String): Int|Unit | Returns the index of the last occurrence of a substring | 20 for Standard Library version 3 3 for Standard Library version 4 |
| lastindexOf(String, String, Int): Int|Unit | Returns the index of the last occurrence of a substring before a certain index | 20 for Standard Library version 3 3 for Standard Library version 4 |
| makeString(List[String], String): String | Concatenates list strings adding a separator | 10 |
| size(String): Int | Returns the size of a string | 1 |
| split(String, String): List[String] | Splits a string delimited by a separator into a list of substrings. | 100 for Standard Library version 3 75 for Standard Library version 4 |
| take(String, Int): String | Takes the first n characters from a string | 1 for Standard Library version 3 20 for Standard Library version 4 |
| takeRight(String, Int): String | Takes the last n characters from a string | 19 for Standard Library version 3 20 for Standard Library version 4 |
# Union functions
| Name | Description | Complexity |
|---|---|---|
| extract(T|Unit): T | Gets a value from a union type argument. Fails if it is unit | 13 |
| isDefined(T|Unit): Boolean | Checks if an argument is not unit | 1 |
| value(T|Unit): T | Gets a value from a union type argument. Fails if it is unit | 13 for Standard Library version 3 2 for Standard Library version 4 |
| valueOrElse(T|Unit, T): T | Returns a value from a union type argument if it's not unit. Otherwise, returns the second argument | 2 |
| valueOrErrorMessage(T|Unit, String): T | Gets a value from a union type argument if it's not unit. Otherwise, fails with the message specified in the second argument | 13 for Standard Library version 3 2 for Standard Library version 4 |
# Verification functions
| Name | Description | Complexity |
|---|---|---|
| bn256groth16Verify(ByteVector, ByteVector, ByteVector): Boolean | Range of functions. Check zk-SNARK by groth16 protocol on the bn254 curve | 800–1650 |
| checkMerkleProof(ByteVector, ByteVector, ByteVector): Boolean | Checks that the data is part of the Merkle tree | 30 |
| createMerkleRoot(List[ByteVector], ByteVector, Int) : ByteVector | Calculates the Merkle root hash for transactions of block | 30 |
| ecrecover(messageHash: ByteVector, signature: ByteVector) | Recovers public key from the message hash and the ECDSA digital signature | 70 |
| groth16Verify(ByteVector, ByteVector, ByteVector): Boolean | Range of functions. Check zk-SNARK by groth16 protocol on the bls12-381 curve | 1200–2700 |
| rsaVerify(digestAlgorithmType, ByteVector, ByteVector, ByteVector): Boolean | Range of functions. Check that the RSA digital signature is valid, i.e. it was created by the owner of the public key | 300 for Standard Library version 3 500–1000 for Standard Library version 4 |
| sigVerify(ByteVector, ByteVector, ByteVector): Boolean | Range of functions. Check that the Curve25519 digital signature is valid, i.e. it was created by the owner of the public key | 100 for Standard library version 3 47–200 for Standard Library version 4 |