Run results for: includes vs indexOf with start position

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.98 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
includes from start	5896165.0 Ops/sec
includes true	6452868.0 Ops/sec
includes false	3950435.0 Ops/sec
indexOf true	7606802.0 Ops/sec
indexOf false	7681973.0 Ops/sec
indexOf nonexistent	7715539.0 Ops/sec
slice includes true	5944431.0 Ops/sec
slice includes false	3711973.0 Ops/sec
substring includes true	5859278.0 Ops/sec
substring includes false	3713845.0 Ops/sec
substring indexOf true	7577506.0 Ops/sec
substring indexOf false	7632228.0 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