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What does the following code log?var str = "I love cats!";console.log(str.indexOf("cat"));A6B7C-1

Question

What does the following code log?

var str = "I love cats!";
console.log(str.indexOf("cat"));

A) 6
B) 7
C) -1

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Solution

Break Down the Problem

  1. Identify the purpose of the code snippet.
  2. Understand what the indexOf method does.

Relevant Concepts

  1. The variable str is assigned the string "I love cats!".
  2. The indexOf method is used to find the position of a substring within a string. It returns:
    • the index of the first occurrence of the substring,
    • -1 if the substring is not found.

Analysis and Detail

  1. The substring we are searching for is "cat".
  2. The string "I love cats!" contains "cat" starting at index 7:
    • The indices of the characters in the string are:
      • I (0), (1), l (2), o (3), v (4), e (5), (6), c (7), a (8), t (9), s (10), ! (11).

Verify and Summarize

  • Since "cat" starts at index 7, the console.log(str.indexOf("cat")); will log 7.

Final Answer

The code logs: 7.

This problem has been solved

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