| slice(start, end) | substring(start, end) | |
|---|---|---|
| start == end | returns empty string | returns empty string |
| end is omitted | extracts characters to the end of the string | returns empty string |
| start / end > string.length | string's length will be used instead | returns empty string |
| start > end | returns empty string | swaps two arguments |
| start = -ve | sets char from the end of string | treated as 0 |
| end = -ve | Math.max(0, string.length + end) | treated as 0 |
| start / end = NaN | treated as 0 | treated as 0 |
| substr(start, length) | |
|---|---|
| length - omitted / > string.length | extracts characters to the end of the string |
| start > string.length | returns empty string |
| start / length = -ve | returns empty string |
| start = NaN | treated as 0 |
| length = NaN | returns empty string |
string = "0123456789"
| string char | "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" |
|---|---|---|---|---|---|---|---|---|---|---|
| index from left | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| index from right | -10 | -9 | -8 | -7 | -6 | -5 | -4 | -3 | -2 | -1 |
| start | end / length | slice(start, end) | substring(start, end) | substr(start, length) |
|---|---|---|---|---|
| 1 | 3 | 12 | 12 | 123 |
| 7 | 3 | 3456 | 789 | |
| 3 | 3 | 345 | ||
| 10 | 1 | 123456789 | ||
| 2 | 100 | 23456789 | 23456789 | 23456789 |
| 100 | 101 | |||
| -7 | -3 | 3456 | ||
| -3 | -7 | |||
| -7 | 3 | 12 | 345 | |
| -3 | 7 | 123456 | 789 | |
| 7 | -3 | 123456 | ||
| 3 | -7 | 12 | ||
| 3 | 3456789 | 3456789 | 3456789 | |
| -3 | 789 | 123456789 | 789 | |
| NaN | 8 | 1234567 | 1234567 | 1234567 |
| NaN | 12 | 123456789 | 123456789 | 123456789 |
| NaN | -7 | 12 | ||
| NaN | -10 | |||
| 3 | NaN | 12 | ||
| -3 | NaN | |||
| NaN | NaN |