3.2 KiB
3.2 KiB
title | id | challengeType |
---|---|---|
Compare a list of strings | 596e457071c35c882915b3e4 | 5 |
Description
Given a list of arbitrarily many strings, implement a function for each of the following conditions:
test if they are all lexically equal test if every string is lexically less than the one after it (i.e. whether the list is in strict ascending order)Instructions
Tests
tests:
- text: <code>allEqual</code> is a function.
testString: assert(typeof allEqual === 'function', '<code>allEqual</code> is a function.');
- text: <code>azSorted</code> is a function.
testString: assert(typeof azSorted === 'function', '<code>azSorted</code> is a function.');
- text: <code>allEqual(["AA", "AA", "AA", "AA"])</code> returns true.
testString: assert(allEqual(testCases[0]), '<code>allEqual(["AA", "AA", "AA", "AA"])</code> returns true.');
- text: <code>azSorted(["AA", "AA", "AA", "AA"])</code> returns false.
testString: assert(!azSorted(testCases[0]), '<code>azSorted(["AA", "AA", "AA", "AA"])</code> returns false.');
- text: <code>allEqual(["AA", "ACB", "BB", "CC"])</code> returns false.
testString: assert(!allEqual(testCases[1]), '<code>allEqual(["AA", "ACB", "BB", "CC"])</code> returns false.');
- text: <code>azSorted(["AA", "ACB", "BB", "CC"])</code> returns true.
testString: assert(azSorted(testCases[1]), '<code>azSorted(["AA", "ACB", "BB", "CC"])</code> returns true.');
- text: <code>allEqual([])</code> returns true.
testString: assert(allEqual(testCases[2]), '<code>allEqual([])</code> returns true.');
- text: <code>azSorted([])</code> returns true.
testString: assert(azSorted(testCases[2]), '<code>azSorted([])</code> returns true.');
- text: <code>allEqual(["AA"])</code> returns true.
testString: assert(allEqual(testCases[3]), '<code>allEqual(["AA"])</code> returns true.');
- text: <code>azSorted(["AA"])</code> returns true.
testString: assert(azSorted(testCases[3]), '<code>azSorted(["AA"])</code> returns true.');
- text: <code>allEqual(["BB", "AA"])</code> returns false.
testString: assert(!allEqual(testCases[4]), '<code>allEqual(["BB", "AA"])</code> returns false.');
- text: <code>azSorted(["BB", "AA"])</code> returns false.
testString: assert(!azSorted(testCases[4]), '<code>azSorted(["BB", "AA"])</code> returns false.');
Challenge Seed
function allEqual (arr) {
// Good luck!
return true;
}
function azSorted (arr) {
// Good luck!
return true;
}
After Test
const testCases = [['AA', 'AA', 'AA', 'AA'], ['AA', 'ACB', 'BB', 'CC'], [], ['AA'], ['BB', 'AA']];
Solution
function allEqual(a) {
let out = true;
let i = 0;
while (++i < a.length) {
out = out && (a[i - 1] === a[i]);
} return out;
}
function azSorted(a) {
let out = true;
let i = 0;
while (++i < a.length) {
out = out && (a[i - 1] < a[i]);
} return out;
}