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---
id: 596e457071c35c882915b3e4
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title: Compare a list of strings
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challengeType: 5
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forumTopicId: 302235
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dashedName: compare-a-list-of-strings
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---
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# --description--
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Given a [list ](https://en.wikipedia.org/wiki/List_(abstract_data_type ) "wp: List\_(abstract_data_type)") of arbitrarily many strings, implement a function for each of the following conditions:
< ul >
< li > test if they are all lexically equal< / li >
< li > test if every string is lexically less than the one after it (i.e. whether the list is in strict ascending order)< / li >
< / ul >
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# --hints--
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`allEqual` should be a function.
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```js
assert(typeof allEqual === 'function');
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```
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`azSorted` should be a function.
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```js
assert(typeof azSorted === 'function');
```
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`allEqual(["AA", "AA", "AA", "AA"])` should return true.
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```js
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assert(allEqual(testCases[0]));
```
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`azSorted(["AA", "AA", "AA", "AA"])` should return false.
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```js
assert(!azSorted(testCases[0]));
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```
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`allEqual(["AA", "ACB", "BB", "CC"])` should return false.
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```js
assert(!allEqual(testCases[1]));
```
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`azSorted(["AA", "ACB", "BB", "CC"])` should return true.
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```js
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assert(azSorted(testCases[1]));
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```
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`allEqual([])` should return true.
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```js
assert(allEqual(testCases[2]));
```
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`azSorted([])` should return true.
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```js
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assert(azSorted(testCases[2]));
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```
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`allEqual(["AA"])` should return true.
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```js
assert(allEqual(testCases[3]));
```
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`azSorted(["AA"])` should return true.
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```js
assert(azSorted(testCases[3]));
```
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`allEqual(["BB", "AA"])` should return false.
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```js
assert(!allEqual(testCases[4]));
```
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`azSorted(["BB", "AA"])` should return false.
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```js
assert(!azSorted(testCases[4]));
```
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# --seed--
## --after-user-code--
```js
const testCases = [['AA', 'AA', 'AA', 'AA'], ['AA', 'ACB', 'BB', 'CC'], [], ['AA'], ['BB', 'AA']];
```
## --seed-contents--
```js
function allEqual(arr) {
return true;
}
function azSorted(arr) {
return true;
}
```
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# --solutions--
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```js
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;
}
```