Bool

o1js / Modules / Bool

Class: Bool

A boolean value. You can use it like this:

const x = new Bool(true);

You can also combine multiple booleans via [[not]], [[and]], [[or]].

Use [[assertEquals]] to enforce the value of a Bool.

Table of contents

Constructors

• constructor

Properties

• value
• Unsafe

Methods

• and
• assertEquals
• assertFalse
• assertTrue
• equals
• isConstant
• not
• or
• sizeInFields
• toBoolean
• toField
• toFields
• toJSON
• toString
• #isBool
• #toVar
• and
• assertEqual
• check
• equal
• fromBytes
• fromFields
• fromJSON
• not
• or
• readBytes
• sizeInBytes
• sizeInFields
• toAuxiliary
• toBytes
• toField
• toFields
• toInput
• toJSON

Constructors

constructor

• new Bool(x)

Parameters

Name	Type
x	boolean | Bool | FieldVar

Defined in

lib/bool.ts:36

Properties

value

• value: FieldVar

Defined in

lib/bool.ts:34

---

Unsafe

▪ Static Unsafe: Object

Type declaration

Name	Type
ofField	(x: Field) => Bool

Defined in

lib/bool.ts:325

Methods

and

▸ and(y): Bool

Parameters

Name	Type	Description
y	boolean | Bool	A Bool to AND with this Bool.

Returns

Bool

a new Bool that is set to true only if this Bool and y are also true.

Defined in

lib/bool.ts:74

---

assertEquals

▸ assertEquals(y, message?): void

Proves that this Bool is equal to y.

Parameters

Name	Type	Description
y	boolean | Bool	a Bool.
message?	string	-

Returns

void

Defined in

lib/bool.ts:97

---

assertFalse

▸ assertFalse(message?): void

Proves that this Bool is false.

Parameters

Name	Type
message?	string

Returns

void

Defined in

lib/bool.ts:128

---

assertTrue

▸ assertTrue(message?): void

Proves that this Bool is true.

Parameters

Name	Type
message?	string

Returns

void

Defined in

lib/bool.ts:114

---

equals

▸ equals(y): Bool

Returns true if this Bool is equal to y.

Parameters

Name	Type	Description
y	boolean | Bool	a Bool.

Returns

Bool

Defined in

lib/bool.ts:143

---

isConstant

▸ isConstant(): this is Object

Returns

this is Object

Defined in

lib/bool.ts:48

---

not

▸ not(): Bool

Returns

Bool

a new Bool that is the negation of this Bool.

Defined in

lib/bool.ts:62

---

or

▸ or(y): Bool

Parameters

Name	Type	Description
y	boolean | Bool	a Bool to OR with this Bool.

Returns

Bool

a new Bool that is set to true if either this Bool or y is true.

Defined in

lib/bool.ts:86

---

sizeInFields

▸ sizeInFields(): number

Returns the size of this type.

Returns

number

Defined in

lib/bool.ts:153

---

toBoolean

▸ toBoolean(): boolean

This converts the Bool to a javascript [[boolean]]. This can only be called on non-witness values.

Returns

boolean

Defined in

lib/bool.ts:184

---

toField

▸ toField(): Field

Converts a Bool to a Field. false becomes 0 and true becomes 1.

Returns

Field

Defined in

lib/bool.ts:55

---

toFields

▸ toFields(): Field[]

Serializes this Bool into Field elements.

Returns

Field[]

Defined in

lib/bool.ts:160

---

toJSON

▸ toJSON(): boolean

Serialize the Bool to a JSON string. This operation does not affect the circuit and can't be used to prove anything about the string representation of the Field.

Returns

boolean

Defined in

lib/bool.ts:176

---

toString

▸ toString(): string

Serialize the Bool to a string, e.g. for printing. This operation does not affect the circuit and can't be used to prove anything about the string representation of the Field.

Returns

string

Defined in

lib/bool.ts:168

---

#isBool

▸ Static Private #isBool(x): x is Bool

Parameters

Name	Type
x	boolean | Bool | FieldVar

Returns

x is Bool

Defined in

lib/bool.ts:344

---

#toVar

▸ Static Private #toVar(x): FieldVar

Parameters

Name	Type
x	boolean | Bool

Returns

FieldVar

Defined in

lib/bool.ts:348

---

and

▸ Static and(x, y): Bool

Boolean AND operation.

Parameters

Name	Type
x	boolean | Bool
y	boolean | Bool

Returns

Bool

Defined in

lib/bool.ts:213

---

assertEqual

▸ Static assertEqual(x, y): void

Asserts if both Bool are equal.

Parameters

Name	Type
x	Bool
y	boolean | Bool

Returns

void

Defined in

lib/bool.ts:233

---

check

▸ Static check(x): void

Parameters

Name	Type
x	Bool

Returns

void

Defined in

lib/bool.ts:321

---

equal

▸ Static equal(x, y): Bool

Checks two Bool for equality.

Parameters

Name	Type
x	boolean | Bool
y	boolean | Bool

Returns

Bool

Defined in

lib/bool.ts:244

---

fromBytes

▸ Static fromBytes(bytes): Bool

Parameters

Name	Type
bytes	number[]

Returns

Bool

Defined in

lib/bool.ts:306

---

fromFields

▸ Static fromFields(fields): Bool

Creates a data structure from an array of serialized Field elements.

Parameters

Name	Type
fields	Field[]

Returns

Bool

Defined in

lib/bool.ts:268

---

fromJSON

▸ Static fromJSON(b): Bool

Deserialize a JSON structure into a Bool. This operation does not affect the circuit and can't be used to prove anything about the string representation of the Field.

Parameters

Name	Type
b	boolean

Returns

Bool

Defined in

lib/bool.ts:287

---

not

▸ Static not(x): Bool

Boolean negation.

Parameters

Name	Type
x	boolean | Bool

Returns

Bool

Defined in

lib/bool.ts:203

---

or

▸ Static or(x, y): Bool

Boolean OR operation.

Parameters

Name	Type
x	boolean | Bool
y	boolean | Bool

Returns

Bool

Defined in

lib/bool.ts:223

---

readBytes

▸ Static readBytes<N>(bytes, offset): [value: Bool, offset: number]

Type parameters

Name	Type
N	extends number

Parameters

Name	Type
bytes	number[]
offset	NonNegativeInteger<N>

Returns

[value: Bool, offset: number]

Defined in

lib/bool.ts:310

---

sizeInBytes

▸ Static sizeInBytes(): number

Returns

number

Defined in

lib/bool.ts:317

---

sizeInFields

▸ Static sizeInFields(): number

Returns the size of this type.

Returns

number

Defined in

lib/bool.ts:294

---

toAuxiliary

▸ Static toAuxiliary(_?): []

Static method to serialize a Bool into its auxiliary data.

Parameters

Name	Type
_?	Bool

Returns

[]

Defined in

lib/bool.ts:261

---

toBytes

▸ Static toBytes(b): number[]

Parameters

Name	Type
b	Bool

Returns

number[]

Defined in

lib/bool.ts:302

---

toField

▸ Static toField(x): Field

Parameters

Name	Type
x	boolean | Bool

Returns

Field

Defined in

lib/bool.ts:196

---

toFields

▸ Static toFields(x): Field[]

Static method to serialize a Bool into an array of Field elements.

Parameters

Name	Type
x	Bool

Returns

Field[]

Defined in

lib/bool.ts:254

---

toInput

▸ Static toInput(x): Object

Parameters

Name	Type
x	Bool

Returns

Object

Name	Type
packed	[Field, number][]

Defined in

lib/bool.ts:298

---

toJSON

▸ Static toJSON(x): boolean

Serialize a Bool to a JSON string. This operation does not affect the circuit and can't be used to prove anything about the string representation of the Field.

Parameters

Name	Type
x	Bool

Returns

boolean

Defined in

lib/bool.ts:279