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@@ -1,6 +1,6 @@
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<p>Given a function <code>fn</code>, return a <strong>memoized</strong> version of that function.</p>
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<p>A <strong>memoized </strong>function is a function that will never be called twice with the same inputs. Instead it will returned a cached value.</p>
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<p>A <strong>memoized </strong>function is a function that will never be called twice with the same inputs. Instead it will return a cached value.</p>
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<p>You can assume there are <strong>3 </strong>possible input functions: <code>sum</code><strong>, </strong><code>fib</code><strong>, </strong>and <code>factorial</code><strong>.</strong></p>
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@@ -14,58 +14,51 @@
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input</strong>
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"sum"
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["call","call","getCallCount","call","getCallCount"]
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[[2,2],[2,2],[],[1,2],[]]
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<strong>Output</strong>
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[4,4,1,3,2]
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<strong>Explanation</strong>
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<strong>Input:</strong>
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fnName = "sum"
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actions = ["call","call","getCallCount","call","getCallCount"]
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values = [[2,2],[2,2],[],[1,2],[]]
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<strong>Output:</strong> [4,4,1,3,2]
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<strong>Explanation:</strong>
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const sum = (a, b) => a + b;
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const memoizedSum = memoize(sum);
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memoizedSum(2, 2); // Returns 4. sum() was called as (2, 2) was not seen before.
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memoizedSum(2, 2); // Returns 4. However sum() was not called because the same inputs were seen before.
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// Total call count: 1
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memoizedSum(1, 2); // Returns 3. sum() was called as (1, 2) was not seen before.
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// Total call count: 2
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memoizedSum(2, 2); // "call" - returns 4. sum() was called as (2, 2) was not seen before.
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memoizedSum(2, 2); // "call" - returns 4. However sum() was not called because the same inputs were seen before.
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// "getCallCount" - total call count: 1
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memoizedSum(1, 2); // "call" - returns 3. sum() was called as (1, 2) was not seen before.
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// "getCallCount" - total call count: 2
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input
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</strong>"factorial"
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["call","call","call","getCallCount","call","getCallCount"]
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[[2],[3],[2],[],[3],[]]
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<strong>Output</strong>
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[2,6,2,2,6,2]
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<strong>Explanation</strong>
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<strong>Input:
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</strong>fnName = "factorial"
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actions = ["call","call","call","getCallCount","call","getCallCount"]
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values = [[2],[3],[2],[],[3],[]]
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<strong>Output:</strong> [2,6,2,2,6,2]
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<strong>Explanation:</strong>
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const factorial = (n) => (n <= 1) ? 1 : (n * factorial(n - 1));
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const memoFactorial = memoize(factorial);
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memoFactorial(2); // Returns 2.
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memoFactorial(3); // Returns 6.
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memoFactorial(2); // Returns 2. However factorial was not called because 2 was seen before.
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// Total call count: 2
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memoFactorial(3); // Returns 6. However factorial was not called because 3 was seen before.
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// Total call count: 2
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memoFactorial(2); // "call" - returns 2.
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memoFactorial(3); // "call" - returns 6.
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memoFactorial(2); // "call" - returns 2. However factorial was not called because 2 was seen before.
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// "getCallCount" - total call count: 2
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memoFactorial(3); // "call" - returns 6. However factorial was not called because 3 was seen before.
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// "getCallCount" - total call count: 2
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input
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</strong>"fib"
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["call","getCallCount"]
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[[5],[]]
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<strong>Output</strong>
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[8,1]
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<strong>Explanation
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</strong>fib(5) = 8
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// Total call count: 1
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<strong>Input:
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</strong>fnName = "fib"
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actions = ["call","getCallCount"]
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values = [[5],[]]
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<strong>Output:</strong> [8,1]
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<strong>Explanation:
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</strong>fib(5) = 8 // "call"
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// "getCallCount" - total call count: 1
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</pre>
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<p> </p>
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@@ -74,7 +67,8 @@ memoFactorial(3); // Returns 6. However factorial was not called because 3 was s
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<ul>
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<li><code>0 <= a, b <= 10<sup>5</sup></code></li>
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<li><code>1 <= n <= 10</code></li>
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<li><code>at most 10<sup>5</sup> function calls</code></li>
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<li><code>at most 10<sup>5</sup> attempts to access callCount</code></li>
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<li><code>input function is sum, fib, or factorial</code></li>
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<li><code>0 <= actions.length <= 10<sup>5</sup></code></li>
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<li><code>actions.length === values.length</code></li>
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<li><code>actions[i]</code> is one of "call" and "getCallCount"</li>
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<li><code>fnName</code> is one of "sum", "factorial" and "fib"</li>
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</ul>
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