Run results for: includes vs indexOf with start position

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser: Chrome 92

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
includes from start	1824809.0 Ops/sec
includes true	1972566.8 Ops/sec
includes false	1171733.5 Ops/sec
indexOf true	2147013.0 Ops/sec
indexOf false	2270191.5 Ops/sec
indexOf nonexistent	2248367.8 Ops/sec
slice includes true	1855203.4 Ops/sec
slice includes false	1144800.8 Ops/sec
substring includes true	1871224.0 Ops/sec
substring includes false	1165118.4 Ops/sec
substring indexOf true	2258418.2 Ops/sec
substring indexOf false	2229017.0 Ops/sec

Script Preparation code:

 var lorem = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.\nPraesent congue, ipsum non scelerisque convallis Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent congue, ipsum non scelerisque convallis Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent congue, ipsum non scelerisque convallis Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent congue, ipsum non scelerisque convallis";

Tests:

includes from start
lorem.includes('\n');
includes true
lorem.includes('\n', 50);
includes false
lorem.includes('\n', 70);
indexOf true
lorem.indexOf('\n') > 50;
indexOf false
lorem.indexOf('\n') > 70;
indexOf nonexistent
lorem.indexOf('\t') > 70;
slice includes true
lorem.slice(50).includes('\n');
slice includes false
lorem.slice(70).includes('\n');
substring includes true
lorem.substring(50).includes('\n');
substring includes false
lorem.substring(70).includes('\n');
substring indexOf true
lorem.substring(50).indexOf('\n') !== -1;
substring indexOf false
lorem.substring(70).indexOf('\n') !== -1;

Run results for: includes vs indexOf with start position

includes from start

includes true

includes false

indexOf true

indexOf false

indexOf nonexistent

slice includes true

slice includes false

substring includes true

substring includes false

substring indexOf true

substring indexOf false