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Compute the number of elements in a normalized slice.
import sliceLength from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-base-length@esm/index.mjs';Returns the number of elements in a normalized slice.
import Slice from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-ctor@esm/index.mjs';
import normalizeSlice from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-base-normalize-slice@esm/index.mjs';
var s = normalizeSlice( new Slice( -3, null, -1 ), 10, false );
// returns <Slice>
var len = sliceLength( s );
// returns 8<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import Slice from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-ctor@esm/index.mjs';
import normalizeSlice from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-base-normalize-slice@esm/index.mjs';
import incrspace from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-incrspace@esm/index.mjs';
import sliceLength from 'https://cdn.jsdelivr.net/gh/stdlib-js/slice-base-length@esm/index.mjs';
var s1 = new Slice( 2, null, -1 );
var s2 = normalizeSlice( s1, 10, false );
var v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 2, 1, 0 ]'
s1 = new Slice( null, null, -3 );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 9, 6, 3, 0 ]'
s1 = new Slice( null, 8, 3 );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 0, 3, 6 ]'
s1 = new Slice( null, 8, null );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 0, 1, 2, 3, 4, 5, 6, 7 ]'
s1 = new Slice( -4, null, -2 );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 6, 4, 2, 0 ]'
s1 = new Slice( null, 8, 3 );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 0, 3, 6 ]'
s1 = new Slice( 8, 2, -2 );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 8, 6, 4 ]'
s1 = new Slice( 3, 8, 2 );
s2 = normalizeSlice( s1, 10, false );
v = sliceLength( s2 );
console.log( '%s => %s => %d', s1.toString(), s2.toString(), v );
console.log( '[ %s ]', incrspace( s2.start, s2.stop || -1, s2.step ).join( ', ' ) );
// => '[ 3, 5, 7 ]'
</script>
</body>
</html>This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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