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
Solution
Break Down the Problem
- Identify the purpose of the code snippet.
- Understand what the
indexOfmethod does.
Relevant Concepts
- The variable
stris assigned the string"I love cats!". - The
indexOfmethod is used to find the position of a substring within a string. It returns:- the index of the first occurrence of the substring,
-1if the substring is not found.
Analysis and Detail
- The substring we are searching for is
"cat". - 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).
- The indices of the characters in the string are:
Verify and Summarize
- Since
"cat"starts at index 7, theconsole.log(str.indexOf("cat"));will log7.
Final Answer
The code logs: 7.
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