anchor/docs/src/pages/docs/javascript-anchor-types.md

title	description
Javascript Anchor Types Reference	Anchor - Javascript Anchor Types Reference

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

---

{% table %}

• 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();
  

---

• Enum
• { variantName: {} }

•   enum MyEnum { One, Two };
  

  await program
  .methods
  .init({ one: {} })
  .rpc();
  

  enum MyEnum { One: { val: u64 }, Two };
  

  await program
  .methods
  .init({ one: { val: 99 } })
  .rpc();
  

---

• Struct
• { val: {} }

•   struct MyStruct { val: u64 };
  

    await program
    .methods
    .init({ val: 99 })
    .rpc();
  

---

• [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();
  

{% /table %}