Did they type the letters in order
A command palette matches what someone typed against a command name: the letters have to appear in order, but not next to each other.
- Every character of the typed text must appear in the command, in the same order.
- Characters may be spread out — gaps in the command are fine.
- Typing nothing matches every command.
- Matching is exact, character for character; nothing is case-folded here.
typedInOrder(typed: string, command: string) → bool
Java needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
boolean typedInOrder(String typed, String command) {
}Worked examples
| Call | Result |
|---|---|
typedInOrder("abc", "axbxc") | true |
typedInOrder("acb", "axbxc") | false |
typedInOrder("", "anything") | true |
typedInOrder("abc", "abc") | true |
Hint
One index walks the typed text, one walks the command. Advance the command index every step, and the typed index only when the two characters agree.
Reference solution in Java
boolean typedInOrder(String typed, String command) {
int i = 0;
for (int k = 0; k < command.length(); k++) {
if (i < typed.length() && typed.charAt(i) == command.charAt(k)) i++;
}
return i == typed.length();
}