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What will be the output of the following code?
var arr = [1, 2, 3];
arr.unshift(0);
console.log(arr);
var arr = [1, 2, 3];
arr.unshift(0);
console.log(arr);
- a)[0, 1, 2, 3]
- b)[1, 2, 3]
- c)[0, 2, 3]
- d)[0, 1, 3]
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
What will be the output of the following code?var arr = [1, 2, 3];arr....
The 'unshift()' method adds an element to the beginning of the array, shifting all other elements to higher indexes.
Most Upvoted Answer
What will be the output of the following code?var arr = [1, 2, 3];arr....
Understanding the Code
The code snippet provided is as follows:
javascript
var arr = [1, 2, 3];
arr.unshift(0);
console.log(arr);
This code demonstrates the use of the `unshift` method in JavaScript.
What Does `unshift` Do?
- The `unshift` method adds one or more elements to the beginning of an array.
- It modifies the original array and returns the new length of the array.
Step-by-Step Execution
1. Initial Array: The variable `arr` is initialized with the array `[1, 2, 3]`.
2. Using `unshift`: The `unshift(0)` method is called on `arr`:
- This adds the number `0` to the front of the array.
- The array now looks like `[0, 1, 2, 3]`.
3. Output: The `console.log(arr)` statement prints the modified array to the console.
Conclusion
- After executing the `unshift` method, the array `arr` is transformed from `[1, 2, 3]` to `[0, 1, 2, 3]`.
- Therefore, the correct answer is option A: `[0, 1, 2, 3]`.
This succinctly illustrates how `unshift` works, confirming that the output reflects the addition of `0` at the start of the array.
The code snippet provided is as follows:
javascript
var arr = [1, 2, 3];
arr.unshift(0);
console.log(arr);
This code demonstrates the use of the `unshift` method in JavaScript.
What Does `unshift` Do?
- The `unshift` method adds one or more elements to the beginning of an array.
- It modifies the original array and returns the new length of the array.
Step-by-Step Execution
1. Initial Array: The variable `arr` is initialized with the array `[1, 2, 3]`.
2. Using `unshift`: The `unshift(0)` method is called on `arr`:
- This adds the number `0` to the front of the array.
- The array now looks like `[0, 1, 2, 3]`.
3. Output: The `console.log(arr)` statement prints the modified array to the console.
Conclusion
- After executing the `unshift` method, the array `arr` is transformed from `[1, 2, 3]` to `[0, 1, 2, 3]`.
- Therefore, the correct answer is option A: `[0, 1, 2, 3]`.
This succinctly illustrates how `unshift` works, confirming that the output reflects the addition of `0` at the start of the array.
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What will be the output of the following code?var arr = [1, 2, 3];arr.unshift(0);console.log(arr);a)[0, 1, 2, 3]b)[1, 2, 3]c)[0, 2, 3]d)[0, 1, 3]Correct answer is option 'A'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about What will be the output of the following code?var arr = [1, 2, 3];arr.unshift(0);console.log(arr);a)[0, 1, 2, 3]b)[1, 2, 3]c)[0, 2, 3]d)[0, 1, 3]Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What will be the output of the following code?var arr = [1, 2, 3];arr.unshift(0);console.log(arr);a)[0, 1, 2, 3]b)[1, 2, 3]c)[0, 2, 3]d)[0, 1, 3]Correct answer is option 'A'. Can you explain this answer?.
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