sliceLength

Compute the number of elements in a normalized slice.

Usage

var sliceLength = require( '@stdlib/slice/base/length' );

sliceLength( slice )

Returns the number of elements in a normalized slice.

var Slice = require( '@stdlib/slice/ctor' );
var normalizeSlice = require( '@stdlib/slice/base/normalize-slice' );

var s = normalizeSlice( new Slice( -3, null, -1 ), 10, false );
// returns <Slice>

var len = sliceLength( s );
// returns 8

Examples

var Slice = require( '@stdlib/slice/ctor' );
var normalizeSlice = require( '@stdlib/slice/base/normalize-slice' );
var incrspace = require( '@stdlib/array/base/incrspace' );
var sliceLength = require( '@stdlib/slice/base/length' );

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 ]'