String Methods Cheat Sheet
const str = 'HeLlo';
const stringObj = new String('grace');
| Methods |
Code Example |
Result |
Return Type |
| indexOf |
str.indexOf('L') |
2 |
number |
| indexOf() |
'hello'.indexOf('l') |
2 |
number |
| indexOf() |
str.indexOf('L') |
2 |
number |
| lastIndexOf() |
'hello'.lastIndexOf('l') |
3 |
number |
| search() |
str.search(/[a-z]/g) |
1 |
number |
| endsWith() |
str.endsWith('z') |
FALSE |
boolean |
| endsWith() |
str.endsWith('o', 6) |
TRUE |
boolean |
| includes() |
str.includes('a') |
FALSE |
boolean |
| startsWith() |
str.startsWith('H', 1) |
FALSE |
boolean |
| startsWith() |
str.startsWith('H') |
TRUE |
boolean |
| charAt() |
str.charAt(1) |
e |
string |
| concat() |
str.concat(' grace') |
HeLlo grace |
string |
| padEnd() |
str.padEnd(10, '!') |
HeLlo!!!!! |
string |
| padStart() |
str.padStart(10, '!') |
!!!!!HeLlo |
string |
| repeat() |
str.repeat(3)) |
HeLloHeLloHeLlo |
string |
| replace() |
str.replace('L', 'l') |
Hello |
string |
| replaceAll() |
hello'.replaceAll('l', 'z') |
hezzo |
string |
| slice() |
str.slice(1, 3) |
eL |
string |
| slice() |
str.slice(2) |
Llo |
string |
| substring() |
str.substring(2) |
Llo |
string |
| substring() |
str.substring(1, 3) |
eL |
string |
| toLowerCase() |
str.toLowerCase() |
hello |
string |
| toUpperCase() |
str.toUpperCase() |
HELLO |
string |
| trim() |
' hello '.trim() |
'hello' |
string |
| trimEnd() |
' hello '.trimEnd() |
' hello' |
string |
| trimStart() |
' hello '.trimStart() |
'hello ' |
string |
| valueOf() |
stringObj.valueOf() |
grace |
string |
| match() |
str.match(/[A-Z]/g) |
["H", "L"] |
array |
| split() |
str.split() |
["HeLlo"] |
array |
| split() |
str.split('') |
["H", "e", "L", "l", "o"] |
array |