Podcast
Questions and Answers
What will be the output of the following code? var str = 'Hello'; alert(str + ' World!');
What will be the output of the following code? var str = 'Hello'; alert(str + ' World!');
- HelloWorld!
- Hello World! (correct)
- Hello, World!
- Hello + World!
Which method is used to access a character at a specific index in a string?
Which method is used to access a character at a specific index in a string?
- getAt()
- charAt() (correct)
- index()
- access()
What will be returned by the expression vowels.charAt(2) if var vowels = 'aeiou';?
What will be returned by the expression vowels.charAt(2) if var vowels = 'aeiou';?
- a
- o
- e
- i (correct)
How can you concatenate two strings without using the + operator?
How can you concatenate two strings without using the + operator?
If you want to find the total number of characters in the string 'example', which property would you use?
If you want to find the total number of characters in the string 'example', which property would you use?
What will be the output of alert(question.indexOf('z')) where question is 'I wonder what the pigs did to make these birds so angry?'?
What will be the output of alert(question.indexOf('z')) where question is 'I wonder what the pigs did to make these birds so angry?'?
What value does lastIndexOf return when searching for 'wood' in the question 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?'?
What value does lastIndexOf return when searching for 'wood' in the question 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?'?
What will be the result of alert(question.indexOf('wood', 30)) where question is 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?'?
What will be the result of alert(question.indexOf('wood', 30)) where question is 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?'?
Which method can be used to convert a string to uppercase in JavaScript?
Which method can be used to convert a string to uppercase in JavaScript?
What does the match method return when applied to the phrase 'There are 3 little pigs.' with the regex /[0–9]/?
What does the match method return when applied to the phrase 'There are 3 little pigs.' with the regex /[0–9]/?
If a string method does not differentiate between whole words and substrings, what issue might this cause?
If a string method does not differentiate between whole words and substrings, what issue might this cause?
Given a string 'My name is Bond.James Bond.', what will alert(phrase.toLowerCase()) return?
Given a string 'My name is Bond.James Bond.', what will alert(phrase.toLowerCase()) return?
Which of the following correctly describes string concatenation in JavaScript?
Which of the following correctly describes string concatenation in JavaScript?
How is the index of a string in JavaScript determined?
How is the index of a string in JavaScript determined?
What is the outcome of executing the following code: var str = 'Hello World'; var subStr = str.substring(1, 5);?
What is the outcome of executing the following code: var str = 'Hello World'; var subStr = str.substring(1, 5);?
Which built-in string method can be used to convert a string to uppercase in JavaScript?
Which built-in string method can be used to convert a string to uppercase in JavaScript?
Which of the following methods can be used to find the length of a string?
Which of the following methods can be used to find the length of a string?
What does the charAt(index) method return when applied to a string?
What does the charAt(index) method return when applied to a string?
What is the result of calling str.split(' ') on the string var str = 'Hello World';?
What is the result of calling str.split(' ') on the string var str = 'Hello World';?
Which of the following statements is true about string literals in JavaScript?
Which of the following statements is true about string literals in JavaScript?
What will the following code output? alert('123'.concat('456'));
What will the following code output? alert('123'.concat('456'));
What happens if you try to access a character at an index that is greater than the length of the string?
What happens if you try to access a character at an index that is greater than the length of the string?
What is the result of the expression var result = 'Hello' + 'World'?
What is the result of the expression var result = 'Hello' + 'World'?
Which of the following statements is true regarding the concat method?
Which of the following statements is true regarding the concat method?
When using array/bracket notation to access a character in the string 'example', what will example[0] return?
When using array/bracket notation to access a character in the string 'example', what will example[0] return?
What will the result of the expression vowels.charAt(5) be if vowels is defined as 'aeiou'?
What will the result of the expression vowels.charAt(5) be if vowels is defined as 'aeiou'?
What will alert return when using question.lastIndexOf('wood') on the string 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?'?
What will alert return when using question.lastIndexOf('wood') on the string 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?'?
Which of the following will correctly return -1 when searching for a character in a string using indexOf?
Which of the following will correctly return -1 when searching for a character in a string using indexOf?
When using the match method with the regular expression /[0-9]/ on the string 'There are 3 little pigs.', what will be the output?
When using the match method with the regular expression /[0-9]/ on the string 'There are 3 little pigs.', what will be the output?
If you want to find the index of 'wood' starting from the 30th position in the string 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?', which method and argument should you use?
If you want to find the index of 'wood' starting from the 30th position in the string 'How much wood could a woodchuck chuck if a woodchuck could chuck wood?', which method and argument should you use?
What will be the output of alert(phrase.toUpperCase()) if phrase is 'My name is Bond.James Bond.'?
What will be the output of alert(phrase.toUpperCase()) if phrase is 'My name is Bond.James Bond.'?
Which procedure will change the string 'Hello World' to 'hello world' using JavaScript string methods?
Which procedure will change the string 'Hello World' to 'hello world' using JavaScript string methods?
What could potentially be an issue when using the lastIndexOf and indexOf methods together in a string?
What could potentially be an issue when using the lastIndexOf and indexOf methods together in a string?
What is the primary difference between a primitive string and a String object in JavaScript?
What is the primary difference between a primitive string and a String object in JavaScript?
Given the string declaration var message = 'Hello World!';, what will alert(message) display?
Given the string declaration var message = 'Hello World!';, what will alert(message) display?
In JavaScript, how are strings represented?
In JavaScript, how are strings represented?
What happens if you use a String object method on a primitive string?
What happens if you use a String object method on a primitive string?
What is the output of var example = 'JavaScript'; alert(example.length);?
What is the output of var example = 'JavaScript'; alert(example.length);?
What will be the value of the variable greeting after executing var greeting = new String('Hi');?
What will be the value of the variable greeting after executing var greeting = new String('Hi');?
If var sentence = 'JavaScript is fun'; is declared, which expression would return the substring 'Java'?
If var sentence = 'JavaScript is fun'; is declared, which expression would return the substring 'Java'?
What does the statement var str = 'abc'; str += 'def'; accomplish?
What does the statement var str = 'abc'; str += 'def'; accomplish?
Which of the following correctly identifies the characteristics of strings in JavaScript?
Which of the following correctly identifies the characteristics of strings in JavaScript?
What will be the result of alert('123'.includes('2'));?
What will be the result of alert('123'.includes('2'));?
Flashcards
String indexOf()
String indexOf()
Returns the index of the first occurrence of a specified substring or character in a string. Returns -1 if not found.
String lastIndexOf()
String lastIndexOf()
Returns the index of the last occurrence of a specified substring or character in a string. Returns -1 if not found.
String indexOf(substring, startIndex)
String indexOf(substring, startIndex)
Finds a substring, starting the search from a particular index.
String match()
String match()
Searches a string for a match against a regular expression (regex).
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String toUpperCase()
String toUpperCase()
Converts a string to all uppercase letters.
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String toLowerCase()
String toLowerCase()
Converts a string to all lowercase letters.
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Regular Expression
Regular Expression
A special sequence of characters that define a search pattern in text.
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indexOf() returns -1
indexOf() returns -1
If the substring isn't found within the string, the indexOf() method will return -1.
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Primitive Types
Primitive Types
Simple data types in JavaScript, such as String, Number, Boolean, Null, and Undefined.
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Object Types
Object Types
Complex data types in JavaScript, encompassing various objects like arrays, dates, and more.
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Strings
Strings
Sequences of characters, representing text in JavaScript.
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String Primitive
String Primitive
A simple string value in JavaScript. (Directly typed string value)
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String Object
String Object
A string value treated as an object in JavaScript.
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Object
Object
A data structure that groups related data and methods.
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JavaScript Types
JavaScript Types
Categories of data in JavaScript, defining how you use that data.
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Primitive vs. Object
Primitive vs. Object
The distinction between simple (primitive) and complex (object) data types in JavaScript.
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String concatenation
String concatenation
Combining strings using the + operator.
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String literals
String literals
Text enclosed in quotation marks (") or apostrophes (').
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Index position
Index position
Position of a character in a string. Starts at 0.
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Accessing string characters
Accessing string characters
Retrieving a character by its index, using bracket notation (e.g., string[2]).
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String length
String length
The total number of characters in a string.
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charAt() method
charAt() method
Returns a character at a specific index.
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Combining strings
Combining strings
Joining multiple strings together.
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indexOf() returns -1
indexOf() returns -1
If a character or substring isn't found in a string, the indexOf() method returns -1.
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lastIndexOf()
lastIndexOf()
Finds the last occurrence of a substring in a string.
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indexOf(substring, startIndex)
indexOf(substring, startIndex)
Finds a substring in a string, starting the search from a given index.
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String match(regex)
String match(regex)
Finds a match in a string using a regular expression (regex).
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toUpperCase()
toUpperCase()
Converts a string to all uppercase letters.
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toLowerCase()
toLowerCase()
Converts a string to all lowercase letters.
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Primitive Types
Primitive Types
Simple data types in JavaScript, like numbers, strings, and booleans.
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Object Types
Object Types
Complex data types in JavaScript, representing collections of data and actions.
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Strings
Strings
Sequences of characters, used for text.
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String Primitive
String Primitive
A simple string value.
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String Object
String Object
A string value treated as an object.
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Objects
Objects
Data structures that group related data and functions.
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JavaScript Types
JavaScript Types
Categories of data in JavaScript.
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Primitive vs. Object (in JavaScript)
Primitive vs. Object (in JavaScript)
The difference between simple and complex data types.
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String Literals
String Literals
Text enclosed in quotes (" or ').
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String Concatenation
String Concatenation
Putting multiple strings together.
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Index Position (in a string)
Index Position (in a string)
The position of a character in a string, starting at 0.
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Accessing String Characters
Accessing String Characters
Getting a character using its position.
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String Concatenation
String Concatenation
Joining two or more strings together using the + operator
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String Literal
String Literal
Text enclosed in quotation marks (" or ' )
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Index Position
Index Position
A character's position in a string. Numbers start at 0.
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Accessing String Characters
Accessing String Characters
Using bracket notation (e.g., string[2]) to get a character by its index.
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String Length
String Length
Total number of characters in a string.
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charAt() method
charAt() method
Returns the character at a given index.
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Combining Strings
Combining Strings
Joining strings together. Uses the + operator.
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- operator in strings
- operator in strings
The operator used to concatenate strings in JavaScript.
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Advanced Web Programming - Chapter 8: Types, Primitives, and Objects - Strings
- Strings in JavaScript are sequences of characters
- Strings can be defined using single quotes (' ') or double quotes (" ")
- Combining strings: Use the + operator to concatenate strings
- Accessing individual characters: Use bracket notation (e.g.,
string[index]) - Index positions start at 0
slice()method extracts a portion of a string, specifies start and end positionssubstr()method extracts a portion of a string, specifies starting position and lengthsplit()method divides a string into an array of substrings based on a delimiterindexOf()finds the first occurrence of a substringlastIndexOf()finds the last occurrence of a substringtoUpperCase()converts a string to uppercasetoLowerCase()converts a string to lowercase
Types in JavaScript
- Basic types: String, Number, Boolean, Null, Undefined, Object
- Primitive types: String, Number, Boolean, Null, Undefined
- Complex types: Object
- Types can be simple or complex
- Terminology: Primitive vs Object
What are Objects?
- Objects have different shapes, sizes, and usefulness
- Objects are abstractions
- Table 11.2 shows pre-defined JavaScript objects (e.g., Array, Boolean, Date, Function, Math, Number, RegExp, String)
Additional String Methods
charAt(index)returns the character at a specified indexmatch()uses a regular expression to find a match in a string
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