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<spanstyle="font-size: 1rem; border-bottom: 1pxsolidgrey;"> Updated Jan 02, 2024 </span>
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<spanstyle="font-size: 1rem; border-bottom: 1pxsolidgrey;"> Updated Jan 07, 2024 </span>
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In this article, we will cover a range of JavaScript interview questions, including those related to the latest versions of the language (ES6, ES7, ES8, and ES9).
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@@ -1521,3 +1521,33 @@ Explanation:
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These variations demonstrate different uses of the `.sort()` method by customizing the sorting logic through comparator functions, enabling diverse sorting patterns for arrays.
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</details>
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<details>
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<summary>
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<h3>46. Explain the output of the following code and correct any errors.</h3>
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```javascript
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let numbers = [1, 2, 3, 4, 5];
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numbers =numbers.map((number) => number *2);
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console.log(numbers.reduce((total, num) => total + num));
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```
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</summary>
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**Answer:**
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```javascript
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// Output: 30 (No errors in the code)
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```
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**Explanation:**
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1. **Array Creation:** The code starts by creating an array named `numbers` containing the values `[1, 2, 3, 4, 5]`.
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2. **Array Mapping:** The `map()` method is used to create a new array by applying a function to each element of the original array. In this case, the function `number=> number *2` doubles each number in the array. The new array becomes `[2, 4, 6, 8, 10]`.
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3. **Array Reduction:** The `reduce()` method is used to reduce the array to a single value by applying a function against an accumulator and each element in the array (from left to right). The function `(total, num) => total + num` adds each number in the array to the `total`, starting with an initial `total` of 0.
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4. **Output:** The final `console.log()` statement outputs the result of the `reduce()` operation, which is 30 (the sum of all the doubled numbers in the array).
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