isString vs typeof === 'string'

Benchmark created on March 22, 2024

Setup

const isString = (x) => typeof x === 'string';
const shortString = 'test';
const longString = 'oilu43hrfewnmz 98 8 uidhjas 9-80rh34fuiaewrh4 yq2389riaewrh4 yq2389ry fuehnwfc sepof uq-89 32hfrn sdugfh sd-0389rhqfaiubsd uifs-ea 98 rew;rfnsf -98 23uiofn jikds n fdsa-8g43riufbewiuaewhf c-sd8afesdaufnewarkferwaf-89ewfhuewifhui aef-e89afghjkfdnf a-f8 pufbaewfgewh a-f9e8 yfdiusbafy fuehnwfc sepof uq-89 32hfrn sdugfh sd-0iaewrh4 yq2389ry fuehnwfc sepof uq-89 32hfrn sdugfh sd-0389rhqfaiubsd uifs-ea 98 rew;rfnsf -98 23uiofn jikds n fdsa-8g43riufbewiuaewhf c-sd8afesdaufnewarkferwaf-89ewfhuewifhui aef-e89afghjkfdnf a-f8 pufbaewfgewh a-f9e8 yfdiusbaf389rhqfaiubsd uifs-ea 98 rew;rfnsf -98 23uiofn jikdsiaewrh4 yq2389ry fuehnwfc sepof uq-89 32hfrn sdugfh sd-0389rhqfaiubsd uifs-ea 98 rew;rfnsf -98 23uiofn jikds n fdsa-8g43riufbewiuaewhf c-sd8afesdaufnewarkferwaf-89ewfhuewifhui aef-e89afghjkfdnf a-f8 pufbaewfgewh a-f9e8 yfdiusbaf n fdsa-8g43riufbewiuaewhf c-sd8afesdaufnewarkferwaf-89ewfhuewifhui aef-e89afghjkfdnf a-f8 pufbaewfgewh a-f9e8 yfdiusbafjdks af-dsa89f awhfjeksnafd';
const stringsObj = {
	shortString: shortString,
	longString: longString,
}

const testByCallback = (value, callback) => callback(value);

const testPropertyByCallbackShort = (obj, callback) => callback(obj.shortString);
const testPropertyByCallbackLong = (obj, callback) => callback(obj.longString);

Test runner

typeof shortString === 'string'

shortString instanceof String

isString(shortString)

testByCallback(shortString, isString)

testPropertyByCallbackShort(stringsObj, isString)

typeof longString === 'string'

longString instanceof String

isString(longString)

testByCallback(longString, isString)

testPropertyByCallbackLong(stringsObj, isString)

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published on March 22, 2024