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
indexOf
method does.
Relevant Concepts
- The variable
str
is assigned the string"I love cats!"
. - 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
- 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)
,l (2)
,o (3)
,v (4)
,e (5)
,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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