Now build the -A flag of the cat tool, as a new function. It makes whitespace visible: every tab character (\t) is replaced by the two characters ^I and every line ends with a literal $ marker (so trailing spaces become obvious). Lines are then joined with newlines.
Note: real cat -A also shows other control characters (such as ^M) and non-ASCII bytes; this version only handles tabs and line ends, like cat -T -E. A blank line becomes just $, and an empty list gives an empty string.
Function signature:
showAllCat(lines)
Example:
Input: lines = ["hello\tworld", "foo"] Output: "hello^Iworld$\nfoo$" When printed: hello^Iworld$ foo$
Another example (a blank line, trailing spaces):
Input: lines = ["a\t", "", "x "] Output: "a^I$\n$\nx $" When printed: a^I$ $ x $
Two transformations per line: replace every tab with
"^I", then append "$". After both, join all the transformed lines with "\n".
A simple way to replace ALL tabs is
line.split("\t").join("^I"). Then concatenate "$":
lines[i].split("\t").join("^I") + "$"
The full solution:
class Solution {
showAllCat(lines) {
let out = [];
for (let i = 0; i < lines.length; i++) {
out.push(lines[i].split("\t").join("^I") + "$");
}
return out.join("\n");
}
}
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