Class Vector<T>

constructor

• new Vector<T>(input): Vector<T>

• Type Parameters

  • T extends DataType<Type, any> = any

  Parameters

  • input: readonly (Vector<T> | Data<T>)[]

  Returns Vector<T>

Readonly TArray

Readonly TType

Readonly TValue

[isConcatSpreadable]

Readonly data

Readonly length

Readonly numChildren

Readonly stride

Readonly type

ArrayType

• get ArrayType(): T["ArrayType"]

• The Array or TypedArray constructor used for the JS representation of the element's values in toArray().

  Returns T["ArrayType"]

VectorName

• get VectorName(): string

• The name of this Vector.

  Returns string

[toStringTag]

• get [toStringTag](): string

• The name that should be printed when the Vector is logged in a message.

  Returns string

byteLength

• get byteLength(): number

• The aggregate size (in bytes) of this Vector's buffers and/or child Vectors.

  Returns number

isMemoized

• get isMemoized(): boolean

• Returns boolean

nullCount

• get nullCount(): number

• The number of null elements in this Vector.

  Returns number

nullable

• get nullable(): boolean

• Whether this Vector's elements can contain null values.

  Returns boolean

[iterator]

• [iterator](): IterableIterator<null | T["TValue"]>

• Iterator for the Vector's elements.

  Returns IterableIterator<null | T["TValue"]>

concat

• concat(...others): Vector<T>

• Combines two or more Vectors of the same type.

  Parameters

  • Rest ...others: Vector<T>[]

    Additional Vectors to add to the end of this Vector.

  Returns Vector<T>

get

• get(index): null | T["TValue"]

• Get an element value by position.

  Parameters

  • index: number

    The index of the element to read.

  Returns null | T["TValue"]

getChild

• getChild<R>(name): null | Vector<any>

• Returns a child Vector by name, or null if this Vector has no child with the given name.

  Type Parameters

  • R extends string | number | symbol

  Parameters

  • name: R

    The name of the child to retrieve.

  Returns null | Vector<any>

getChildAt

• getChildAt<R>(index): null | Vector<R>

• Returns a child Vector by index, or null if this Vector has no child at the supplied index.

  Type Parameters

  • R extends DataType<Type, any> = any

  Parameters

  • index: number

    The index of the child to retrieve.

  Returns null | Vector<R>

includes

• includes(element, offset?): boolean

• Parameters

  • element: T["TValue"]

  • Optional offset: number

  Returns boolean

indexOf

• indexOf(element, offset?): number

• Retrieve the index of the first occurrence of a value in an Vector.

  Parameters

  • element: T["TValue"]

    The value to locate in the Vector.

  • Optional offset: number

    The index at which to begin the search. If offset is omitted, the search starts at index 0.

  Returns number

isValid

• isValid(index): boolean

• Check whether an element is null.

  Parameters

  • index: number

    The index at which to read the validity bitmap.

  Returns boolean

memoize

• memoize(): MemoizedVector<T>

• Adds memoization to the Vector's get method. For dictionary vectors, this method return a vector that memoizes only the dictionary values.

  Memoization is very useful when decoding a value is expensive such as Utf8. The memoization creates a cache of the size of the Vector and therefore increases memory usage.

  Returns MemoizedVector<T>

  A new vector that memoizes calls to get.

set

• set(index, value): void

• Set an element value by position.

  Parameters

  • index: number

    The index of the element to write.

  • value: null | T["TValue"]

    The value to set.

  Returns void

slice

• slice(begin?, end?): Vector<T>

• Return a zero-copy sub-section of this Vector.

  Parameters

  • Optional begin: number

  • Optional end: number

    The end of the specified portion of the Vector. This is exclusive of the element at the index 'end'.

  Returns Vector<T>

toArray

• toArray(): T["TArray"]

• Return a JavaScript Array or TypedArray of the Vector's elements.

  Returns T["TArray"]

  An Array or TypedArray of the Vector's elements, based on the Vector's DataType.

  Note

  If this Vector contains a single Data chunk and the Vector's type is a primitive numeric type corresponding to one of the JavaScript TypedArrays, this method returns a zero-copy slice of the underlying TypedArray values. If there's more than one chunk, the resulting TypedArray will be a copy of the data from each chunk's underlying TypedArray values.

toJSON

• toJSON(): (null | T["TValue"])[]

• Returns (null | T["TValue"])[]

toString

• toString(): string

• Returns a string representation of the Vector.

  Returns string

  A string representation of the Vector.

unmemoize

• unmemoize(): Vector<T>

• Returns a vector without memoization of the get method. If this vector is not memoized, this method returns this vector.

  Returns Vector<T>

  A new vector without memoization.