What is the significance of 'scope' in JavaScript?

The correct answer is A. It defines the lifetime and accessibility of a variable. Scope in JavaScript defines where a variable lives - where it can be read and where it ceases to exist - making option A correct. A variable declared inside a function, for example, is not accessible outside it, because its scope is limited to that function's block. Options B…

Client-Side Scripting and Media Queries

Question

Options

AIt defines the lifetime and accessibility of a variable.
BIt refers to the overall speed of a JavaScript application.
CIt is used to define the layout of a web page.
DIt refers to the number of users that can access a JavaScript function.

How the community answered

(52 responses)

A
92% (48)
B
2% (1)
C
6% (3)

Explanation

Scope in JavaScript defines where a variable lives - where it can be read and where it ceases to exist - making option A correct. A variable declared inside a function, for example, is not accessible outside it, because its scope is limited to that function's block. Options B, C, and D are distractors that confuse "scope" with unrelated concepts: application performance (B) is about execution speed, page layout (C) belongs to CSS/HTML, and user access counts (D) are an application-level concern with no meaning in JavaScript's language specification. Memory tip: Think of scope as a spotlight - it illuminates only the variables that are "in range" at any given point in the code, leaving everything outside in the dark.

Topics

#JavaScript scope#variable scope#variable accessibility#scope lifetime

Community Discussion

No community discussion yet for this question.

Full 1D0-720 Practice