Create array views for easy data manipulation, select elements using Python-like slice notation, enable efficient selection of elements using index lists and boolean masks.
npm install array-view
!Build and test
Array View is a TypeScript library that provides a powerful set of utilities for working with arrays in
a versatile and efficient manner. These classes enable developers to create views of arrays, manipulate data with ease,
and select specific elements using index lists, masks, and slice parameters.
Array View offers a Python-like slicing experience for efficient data manipulation and selection of array elements.
bash
npm install array-view
`Quick examples
$3
typescript
import { view } from "array-view";const originalArray = [1, 2, 3, 4, 5, 6, 7, 8, 9];
const originalView = view(originalArray);
originalView.loc['1:7:2']; // [2, 4, 6]
originalView.loc[':3']; // [1, 2, 3]
originalView.loc['::-1']; // [9, 8, 7, 6, 5, 4, 3, 2, 1]
originalView.loc[2]; // 3
originalView.loc[4]; // 5
originalView.loc[-1]; // 9
originalView.loc[-2]; // 8
originalView.loc['1:7:2'] = [22, 44, 66];
originalArray; // [1, 22, 3, 44, 5, 66, 7, 8, 9]
`$3
typescript
import { view, mask, select, slice } from "array-view";const originalArray = [1, 2, 3, 4, 5];
const originalView = view(originalArray);
originalView.subview(mask([true, false, true, false, true])).toArray(); // [1, 3, 5]
originalView.subview(select([1, 2, 4])).toArray(); // [2, 3, 5]
originalView.subview(slice('::-1')).toArray(); // [5, 4, 3, 2, 1]
originalView.subview(slice([,,-1])).toArray(); // [5, 4, 3, 2, 1]
originalView.subview(mask([true, false, true, false, true])).apply((x: number) => x * 10);
originalArray; // [10, 2, 30, 4, 50]
`$3
typescript
import { view, mask, select, slice } from "array-view";const originalArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const subview = view(originalArray)
.subview('::2') // [1, 3, 5, 7, 9]
.subview(mask([true, false, true, true, true])) // [1, 5, 7, 9]
.subview(select([0, 1, 2])) // [1, 5, 7]
.subview('1:') // [5, 7]
subview.loc[':'] = [55, 77];
originalArray; // [1, 2, 3, 4, 55, 6, 77, 8, 9, 10]
`$3
typescript
import { view, mask } from "array-view";const array1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const array2 = [-1, -2, -3, -4, -5, -6, -7, -8, -9, -10];
const mask = view(array1).is((x: number) => x % 3 === 0);
// MaskSelector([false, false, true, false, false, true, false, false, true, false])
view(array2)
.subview(mask)
.applyWith(
view(array1).subview(mask),
(lhs: number, rhs: number) => lhs + rhs,
)
.toArray();
// [-1, -2, 0, -4, -5, 0, -7, -8, 0, -10]);
``