Javascript Anchor Types Reference

This reference shows you how anchor maps rust types to javascript/typescript types in the client.

Rust Type Javascript Type Example Note
bool bool 
await program
    .methods
    .init(true)
    .rpc();
u64/u128/i64/i128 anchor.BN 
await program
    .methods
    .init(new anchor.BN(99))
    .rpc();
 https://github.com/indutny/bn.js/
u8/u16/u32/i8/i16/i32 number 
await program
    .methods
    .init(99)
    .rpc();
f32/f64 number 
await program
    .methods
    .init(1.0)
    .rpc();
Option<T> null or T 
await program
    .methods
    .init(null)
    .rpc();
Enum { variantName: {} } 
// Rust
enum MyEnum { One, Two };
// JS
await program
    .methods
    .init({ one: {} })
    .rpc();

// Rust 
enum MyEnum { One: { val: u64 }, Two };
// JS
await program
    .methods
    .init({ one: { val: 99 } })
    .rpc();
No support for tuple variants
Struct { val: {} } 
// Rust
struct MyStruct { val: u64 };
// JS
await program
    .methods
    .init({ val: 99 })
    .rpc();
No support for tuple structs
[T; N] [ T ] 
await program
    .methods
    .init([1,2,3])
    .rpc();
String string 
await program
    .methods
    .init("hello")
    .rpc();
Vec<T> [ T ] 
await program
    .methods
    .init([1,2,3])
    .rpc();