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Computer Chapter 3 : Topic 4.4
Arrays in JavaScript
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In JavaScript, a student writes a program to store marks of 10 students and then processes them using loops and conditions. What is the most suitable data structure for this task?
Reasoning: Arrays are designed to store multiple values under one name and allow easy traversal using loops, making them ideal for processing collections like student marks.
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A program uses a loop to access each element of an array named scores and calculates the total sum of all values. Which programming concept is mainly being applied here?
Reasoning: The loop repeats actions for each element in the array, which is a clear example of repetition/iteration in algorithms.
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A JavaScript program checks each value in an array and prints only those numbers that are greater than 50. Which control structure is essential for this operation?
Reasoning: Selection using an if statement is required to filter values based on a condition (greater than 50).
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A student is asked to find the largest number in an array using JavaScript by comparing each element one by one. Which algorithmic approach is being used?
Reasoning: Finding the largest value requires checking each element sequentially and updating the maximum value during traversal.
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In a JavaScript program, an array is used to store daily temperatures, and each value is increased by 2 degrees using a loop. What type of operation is being performed on the array elements?
Reasoning: Each element is modified using a loop, which is a transformation process applied through iteration.
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A programmer wants to check whether a specific value exists inside an array of names using JavaScript. Which approach is most appropriate for this task?
Reasoning: Searching in an unsorted array requires iterating through each element and comparing it with the target value.
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A JavaScript program processes an array where elements are accessed using their index positions starting from 0. If an array has 5 elements, what is the highest valid index?
Reasoning: Array indexing in JavaScript starts at 0, so the last element of a 5-element array is at index 4.
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