String Search Methods
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does includes() return true or false?
2. Does indexOf() return a boolean like includes() does?
3. Does indexOf() return -1 when the substring isn't found?
4. Is 'indexof' with a lowercase o valid JavaScript syntax?
5. Do these search methods need a substring passed as an argument?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1text.includes("world") | AReturns the position where "world" starts in text | |
| 2text.indexOf("world") | Bword.includes("cat") | |
| 3The value returned when a substring isn't found | CReturns true if text contains "world" | |
| 4Checks whether a substring exists in a string | D-1 | |
| 5text.Includes("world") | EWrong - method names are camelCase: indexOf | |
| 6text.indexof("world") | FWrong - 'includes' must start with a lowercase i |
C
Definitions
includes()
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
console.log(text.________("world"));
2.
console.log(text._______("world"));
3.
let found = word.________("cat");
4.
let pos = word._______("cat");
5.
let hasDog = text.________("dog");
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let a = "hi there";
B
console.log(a.Includes("hi"));
C
console.log(a);
Question 2
A
let b = "good day";
B
console.log(b);
C
console.log(b.indexof("day"));
Question 3
A
let c = "hi there";
B
console.log(c);
C
console.log(c.includes);
Question 4
A
console.log(d.indexOf);
B
let d = "good day";
C
console.log(d);
Question 5
A
let e = "hi there";
B
console.log(e.includes("hi"));
C
console.log(e);
D
console.log(e.Includes("hi"));
Answer Key
String Search Methods
Section A: Quick Questions
Q1
A — Yes
Q2
B — No
Q3
A — Yes
Q4
B — No
Q5
A — Yes
Section B: Match the Pairs
Q1
text.includes("world") → Returns true if text contains "world"
Q2
text.indexOf("world") → Returns the position where "world" starts in text
Q3
The value returned when a substring isn't found → -1
Q4
Checks whether a substring exists in a string → word.includes("cat")
Q5
text.Includes("world") → Wrong - 'includes' must start with a lowercase i
Q6
text.indexof("world") → Wrong - method names are camelCase: indexOf
Section C: Definitions
Q1
includes() — Checks whether a string contains a given substring, returning true or false.Section D: Fill in the Blanks
Q1
console.log(text.includes("world"));Q2
console.log(text.indexOf("world"));Q3
let found = word.includes("cat");Q4
let pos = word.indexOf("cat");Q5
let hasDog = text.includes("dog");Section E: Spot the Error
Q1
B — 'includes' must be lowercase - a capital I causes an error.
Q2
C — Method names are camelCase - it should be indexOf, not indexof.
Q3
C — Missing parentheses and the search value - includes() needs an argument.
Q4
A — Missing parentheses and the search value - indexOf() needs an argument.
Q5
D — 'includes' must be lowercase - a capital I causes an error.