memoize

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Memoize

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Given a function <code>fn</code>, return a&nbsp;memoized&nbsp;version of that function.

A&nbsp;memoized&nbsp;function is a function that will never be called twice with&nbsp;the same inputs. Instead it will return&nbsp;a cached value.

You can assume there are&nbsp;3&nbsp;possible input functions:&nbsp;<code>sum</code>, <code>fib</code>,&nbsp;and&nbsp;<code>factorial</code>.

<ul>
	<li><code>sum</code>&nbsp;accepts two integers&nbsp;<code>a</code> and <code>b</code> and returns <code>a + b</code>.</li>
	<li><code>fib</code>&nbsp;accepts a&nbsp;single integer&nbsp;<code>n</code> and&nbsp;returns&nbsp;<code>1</code> if <code>n &lt;= 1</code> or&nbsp;<code>fib(n - 1) + fib(n - 2)</code>&nbsp;otherwise.</li>
	<li><code>factorial</code>&nbsp;accepts a single integer&nbsp;<code>n</code> and returns <code>1</code>&nbsp;if&nbsp;<code>n &lt;= 1</code>&nbsp;or&nbsp;<code>factorial(n - 1) * n</code>&nbsp;otherwise.</li>
</ul>

&nbsp;
Example 1:

<pre>
Input:
fnName = &quot;sum&quot;
actions = [&quot;call&quot;,&quot;call&quot;,&quot;getCallCount&quot;,&quot;call&quot;,&quot;getCallCount&quot;]
values = [[2,2],[2,2],[],[1,2],[]]
Output: [4,4,1,3,2]
Explanation:
const sum = (a, b) =&gt; a + b;
const memoizedSum = memoize(sum);
memoizedSum(2, 2); // &quot;call&quot; - returns 4. sum() was called as (2, 2) was not seen before.
memoizedSum(2, 2); // &quot;call&quot; - returns 4. However sum() was not called because the same inputs were seen before.
// &quot;getCallCount&quot; - total call count: 1
memoizedSum(1, 2); // &quot;call&quot; - returns 3. sum() was called as (1, 2) was not seen before.
// &quot;getCallCount&quot; - total call count: 2
</pre>

Example 2:

<pre>
Input:
fnName = &quot;factorial&quot;
actions = [&quot;call&quot;,&quot;call&quot;,&quot;call&quot;,&quot;getCallCount&quot;,&quot;call&quot;,&quot;getCallCount&quot;]
values = [[2],[3],[2],[],[3],[]]
Output: [2,6,2,2,6,2]
Explanation:
const factorial = (n) =&gt; (n &lt;= 1) ? 1 : (n * factorial(n - 1));
const memoFactorial = memoize(factorial);
memoFactorial(2); // &quot;call&quot; - returns 2.
memoFactorial(3); // &quot;call&quot; - returns 6.
memoFactorial(2); // &quot;call&quot; - returns 2. However factorial was not called because 2 was seen before.
// &quot;getCallCount&quot; - total call count: 2
memoFactorial(3); // &quot;call&quot; - returns 6. However factorial was not called because 3 was seen before.
// &quot;getCallCount&quot; - total call count: 2
</pre>

Example 3:

<pre>
Input:
fnName = &quot;fib&quot;
actions = [&quot;call&quot;,&quot;getCallCount&quot;]
values = [[5],[]]
Output: [8,1]
Explanation:
fib(5) = 8 // &quot;call&quot;
// &quot;getCallCount&quot; - total call count: 1
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>0 &lt;= a, b &lt;= 105</code></li>
	<li><code>1 &lt;= n &lt;= 10</code></li>
	<li><code>0 &lt;= actions.length &lt;= 105</code></li>
	<li><code>actions.length === values.length</code></li>
	<li><code>actions[i]</code> is one of &quot;call&quot; and &quot;getCallCount&quot;</li>
	<li><code>fnName</code> is one of &quot;sum&quot;, &quot;factorial&quot; and&nbsp;&quot;fib&quot;</li>
</ul>

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