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Nightly /
Converting Types

Icon LinkConverting Types

Below are some common type conversions in Sway:

Icon LinkIdentity Conversions

Icon LinkConvert to Identity

let identity_from_b256: Identity = Identity::Address(Address::from(b256_address));
let identity_from_address: Identity = Identity::Address(address);
let identity_from_contract_id: Identity = Identity::ContractId(contract_id);

Icon LinkConvert Identity to ContractId or Address

match my_identity {
    Identity::Address(address) => log(address),
    Identity::ContractId(contract_id) => log(contract_id),
};

Icon LinkConvert ContractId or Address to b256

let b256_from_address: b256 = address.into();
let b256_from_contract_id: b256 = contract_id.into();

Icon LinkConvert b256 to ContractId or Address

let address_from_b256: Address = Address::from(b256_address);
let contract_id_from_b256: ContractId = ContractId::from(b256_address);

Icon LinkString Conversions

Icon LinkConvert str to str[]

use std::primitive_conversions::str::*;
let fuel_str: str = "fuel";
let fuel_str_array: str[4] = fuel_str.try_as_str_array().unwrap();

Icon LinkConvert str[] to str

let fuel_str_array: str[4] = __to_str_array("fuel");
let fuel_str: str = from_str_array(fuel_str_array);

Icon LinkNumber Conversions

Icon LinkConvert to u256

let u8_1: u8 = 2u8;
let u16_1: u16 = 2u16;
let u32_1: u32 = 2u32;
let u64_1: u64 = 2u64;
let b256_1: b256 = 0x0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20;
 
let u256_from_u8: u256 = u8_1.as_u256();
let u256_from_u16: u256 = u16_1.as_u256();
let u256_from_u32: u256 = u32_1.as_u256();
let u256_from_u64: u256 = u64_1.as_u256();
let u256_from_b256: u256 = b256_1.as_u256();

Icon LinkConvert to u64

use std::primitive_conversions::u64::*;
let u8_1: u8 = 2u8;
let u16_1: u16 = 2u16;
let u32_1: u32 = 2u32;
let u256_1: u256 = 0x0000000000000000000000000000000000000000000000000000000000000002u256;
 
let u64_from_u8: u64 = u8_1.as_u64();
 
let u64_from_u16: u64 = u16_1.as_u64();
 
let u64_from_u32: u64 = u32_1.as_u64();
 
let u64_from_u256: Option<u64> = <u64 as TryFrom<u256>>::try_from(u256_1);

Icon LinkConvert to u32

use std::{primitive_conversions::{u32::*, u64::*,},};
let u8_1: u8 = 2u8;
let u16_1: u16 = 2u16;
let u64_1: u64 = 2;
let u256_1: u256 = 0x0000000000000000000000000000000000000000000000000000000000000002u256;
 
let u32_from_u8: u32 = u8_1.as_u32();
 
let u32_from_u16: u32 = u16_1.as_u32();
 
let u32_from_u64_1: Option<u32> = u64_1.try_as_u32();
let u32_from_u64_2: Option<u32> = <u32 as TryFrom<u64>>::try_from(u64_1);
 
let u32_from_u256: Option<u32> = <u32 as TryFrom<u256>>::try_from(u256_1);

Icon LinkConvert to u16

use std::{primitive_conversions::{u16::*, u32::*, u64::*,},};
let u8_1: u8 = 2u8;
let u32_1: u32 = 2u32;
let u64_1: u64 = 2;
let u256_1: u256 = 0x0000000000000000000000000000000000000000000000000000000000000002u256;
 
let u16_from_u8: u16 = u8_1.as_u16();
 
let u16_from_u32_1: Option<u16> = u32_1.try_as_u16();
let u16_from_u32_2: Option<u16> = <u16 as TryFrom<u32>>::try_from(u32_1);
 
let u16_from_u64_1: Option<u16> = u64_1.try_as_u16();
let u16_from_u64_2: Option<u16> = <u16 as TryFrom<u64>>::try_from(u64_1);
 
let u16_from_u256: Option<u16> = <u16 as TryFrom<u256>>::try_from(u256_1);

Icon LinkConvert to u8

use std::{primitive_conversions::{u16::*, u32::*, u64::*, u8::*,},};
let u16_1: u16 = 2u16;
let u32_1: u32 = 2u32;
let u64_1: u64 = 2;
let u256_1: u256 = 0x0000000000000000000000000000000000000000000000000000000000000002u256;
 
let u8_from_u16_1: Option<u8> = u16_1.try_as_u8();
let u8_from_u16_2: Option<u8> = <u8 as TryFrom<u16>>::try_from(u16_1);
 
let u8_from_u32_1: Option<u8> = u32_1.try_as_u8();
let u8_from_u32_2: Option<u8> = <u8 as TryFrom<u32>>::try_from(u32_1);
 
let u8_from_u64_1: Option<u8> = u64_1.try_as_u8();
let u8_from_u64_2: Option<u8> = <u8 as TryFrom<u64>>::try_from(u64_1);
 
let u8_from_u256: Option<u8> = <u8 as TryFrom<u256>>::try_from(u256_1);

Icon LinkConvert to Bytes

use std::{bytes::Bytes, bytes_conversions::{b256::*, u16::*, u256::*, u32::*, u64::*,}};
let num = 5;
let little_endian_bytes: Bytes = num.to_le_bytes();
let big_endian_bytes: Bytes = num.to_be_bytes();

Icon LinkConvert from Bytes

use std::{bytes::Bytes, bytes_conversions::{b256::*, u16::*, u256::*, u32::*, u64::*,}};
let u16_from_le_bytes: u16 = u16::from_le_bytes(little_endian_bytes);
let u16_from_be_bytes: u16 = u16::from_be_bytes(big_endian_bytes);
 
let u32_from_le_bytes: u32 = u32::from_le_bytes(little_endian_bytes);
let u32_from_be_bytes: u32 = u32::from_be_bytes(big_endian_bytes);
 
let u64_from_le_bytes: u64 = u64::from_le_bytes(little_endian_bytes);
let u64_from_be_bytes: u64 = u64::from_be_bytes(big_endian_bytes);
 
let u256_from_le_bytes = u256::from_le_bytes(little_endian_bytes);
let u256_from_be_bytes = u256::from_be_bytes(big_endian_bytes);
 
let b256_from_le_bytes = b256::from_le_bytes(little_endian_bytes);
let b256_from_be_bytes = b256::from_be_bytes(big_endian_bytes);

Icon LinkByte Array Conversions

Icon LinkConvert to a Byte Array

use std::array_conversions::{b256::*, u16::*, u256::*, u32::*, u64::*,};
let u16_1: u16 = 2u16;
let u32_1: u32 = 2u32;
let u64_1: u64 = 2u64;
let u256_1: u256 = 0x0000000000000000000000000000000000000000000000000000000000000002u256;
let b256_1: b256 = 0x000000000000000000000000000000000000000000000000000000000000002A;
// little endian
let le_byte_array_from_u16: [u8; 2] = u16_1.to_le_bytes();
let le_byte_array_from_u32: [u8; 4] = u32_1.to_le_bytes();
let le_byte_array_from_u64: [u8; 8] = u64_1.to_le_bytes();
let le_byte_array_from_u256: [u8; 32] = u256_1.to_le_bytes();
let le_byte_array_from_b256: [u8; 32] = b256_1.to_le_bytes();
// big endian
let be_byte_array_from_u16: [u8; 2] = u16_1.to_be_bytes();
let be_byte_array_from_u32: [u8; 4] = u32_1.to_be_bytes();
let be_byte_array_from_u64: [u8; 8] = u64_1.to_be_bytes();
let be_byte_array_from_u256: [u8; 32] = u256_1.to_be_bytes();
let be_byte_array_from_b256: [u8; 32] = b256_1.to_be_bytes();

Icon LinkConvert from a Byte Array

use std::array_conversions::{b256::*, u16::*, u256::*, u32::*, u64::*,};
let u16_byte_array: [u8; 2] = [2_u8, 1_u8];
let u32_byte_array: [u8; 4] = [4_u8, 3_u8, 2_u8, 1_u8];
let u64_byte_array: [u8; 8] = [8_u8, 7_u8, 6_u8, 5_u8, 4_u8, 3_u8, 2_u8, 1_u8];
let u256_byte_array: [u8; 32] = [
    32_u8, 31_u8, 30_u8, 29_u8, 28_u8, 27_u8, 26_u8, 25_u8, 24_u8, 23_u8, 22_u8,
    21_u8, 20_u8, 19_u8, 18_u8, 17_u8, 16_u8, 15_u8, 14_u8, 13_u8, 12_u8, 11_u8,
    10_u8, 9_u8, 8_u8, 7_u8, 6_u8, 5_u8, 4_u8, 3_u8, 2_u8, 1_u8,
];
// little endian
let le_u16_from_byte_array: u16 = u16::from_le_bytes(u16_byte_array);
let le_u32_from_byte_array: u32 = u32::from_le_bytes(u32_byte_array);
let le_u64_from_byte_array: u64 = u64::from_le_bytes(u64_byte_array);
let le_u256_from_byte_array: u256 = u256::from_le_bytes(u256_byte_array);
let le_b256_from_byte_array: b256 = b256::from_le_bytes(u256_byte_array);
// big endian
let be_u16_from_byte_array: u16 = u16::from_be_bytes(u16_byte_array);
let be_u32_from_byte_array: u32 = u32::from_be_bytes(u32_byte_array);
let be_u64_from_byte_array: u64 = u64::from_be_bytes(u64_byte_array);
let be_u256_from_byte_array: u256 = u256::from_be_bytes(u256_byte_array);
let be_b256_from_byte_array: b256 = b256::from_be_bytes(u256_byte_array);