Run results for: Remove last item from / separated string

Run details:

User agent: Mozilla/5.0 (Android 10; Mobile; rv:68.0) Gecko/68.0 Firefox/68.0

Browser: Firefox Mobile 68

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
With Regexp	378342.7 Ops/sec
With Regexp of smaller scope	319694.1 Ops/sec
With for-loop	6490015.0 Ops/sec
With for-loop (initialized length)	5584310.0 Ops/sec
With lastIndexOf and substring	15987100.0 Ops/sec
With lastIndexOf and slice	16107840.0 Ops/sec
With split, slice, join	110381.5 Ops/sec
With split, pop, join	122345.0 Ops/sec

Script Preparation code:

var str = 'lorem/ipsum/dolor/sit/amet/consectetur/adipiscing/elit/sed/do/eiusmod/tempor/incididunt/ut/labore/et/dolore/magna/aliqua/ut/enim/ad/minim/veniam/quis/nostrud/exercitation/ullamco/laboris/nisi/ut/aliquip/ex/ea/commodo/consequat/duis/aute/irure/dolor/in/reprehenderit/in/voluptate/velit/esse/cillum/dolore/eu/fugiat/nulla/pariatur/excepteur/sint/occaecat/cupidatat/non/proident/sunt/in/culpa/qui/officia/deserunt/mollit/anim/id/est/laborum/base/resource/collection/video-collection'

Tests:

With Regexp
str.replace(/\/[^/]*$/, '')
With Regexp of smaller scope
str.replace(/\/[a-z-]*$/, '')
With for-loop
var index = -1; for (var i = str.length - 1; i >= 0; i--) { if (str[i] === '/') { i = index; break; } } str.substring(0, index);
With for-loop (initialized length)
var index = -1; lastIndex = str.length - 1; for (var i = lastIndex; i > -1; i--) { if (str[i] === '/') { i = index; break; } } str.substring(0, index);
With lastIndexOf and substring
str.substring(0, str.lastIndexOf('/'))
With lastIndexOf and slice
str.slice(0, str.lastIndexOf('/'))
With split, slice, join
str.split('/').slice(0, -1).join('/')
With split, pop, join
var a = str.split('/') a.pop() a.join('/')

Run results for: Remove last item from / separated string

With Regexp

With Regexp of smaller scope

With for-loop

With for-loop (initialized length)

With lastIndexOf and substring

With lastIndexOf and slice

With split, slice, join

With split, pop, join