What this deck covers
This deck focuses on Strings, giving you a quick way to review the definitions, rules, and examples that matter most for AP Computer Science Principles.
AP Computer Science Principles Flashcards: Strings
Study Strings in AP Computer Science Principles with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.
AP Computer Science Principles
Strings
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QUESTION
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Find and correct the error: 'Hello'.indexOf('e') in Python.
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ANSWER
Correct: 'Hello'.find('e'). Python uses find() instead of indexOf().
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Flashcard 1: Find and correct the error: 'Hello'.indexOf('e') in Python.
Answer: Correct: 'Hello'.find('e'). Python uses find() instead of indexOf().
Flashcard 2: What method finds a substring's first occurrence in Python?
Answer: find(). Locates initial position of substring occurrence.
Flashcard 3: What method converts a string to uppercase in JavaScript?
Answer: toUpperCase(). Converts all letters to uppercase format.
Flashcard 4: Identify the function that checks if a character is a digit in Python.
Answer: isdigit(). Returns True if character is numeric digit.
Flashcard 5: Which function creates a string from a list of characters in Python?
Answer: join(). Combines list elements into single string.
Flashcard 6: Which method checks the equality of two strings in Java?
Answer: equals(). Compares string content for exact match.
Flashcard 7: What method finds a substring's first occurrence in Python?
Answer: find(). Locates initial position of substring occurrence.
Flashcard 8: Find and correct the error: 'Hello'.substring(0, 3) in Python.
Answer: Correct: 'Hello'[0:3]. Python uses slice notation instead of substring method.
Flashcard 9: Identify the method to capitalize the first character of a string in Python.
Answer: capitalize(). Makes first letter uppercase, rest lowercase.
Flashcard 10: What method checks if a string contains a specific substring in JavaScript?
Answer: includes(). Checks if substring exists within the string.
Flashcard 11: Identify the method to encode a string to UTF-8 in Python.
Answer: encode('utf-8'). Converts string to UTF-8 byte encoding.
Flashcard 12: What function converts a string to a float in Python?
Answer: float(). Converts string to decimal number format.
Flashcard 13: What function converts a string to a list of characters in Python?
Answer: list(). Creates list with each character as element.
Flashcard 14: Which method splits a string into an array in Python?
Answer: split(). Divides string into array elements by delimiter.
Flashcard 15: What function converts an integer to a string in JavaScript?
Answer: toString(). Converts numeric value to string representation.
Flashcard 16: State the method to check if a string is empty in JavaScript.
Answer: length property or === ''. Tests length property or compares to empty.
Flashcard 17: State the method to check if a string ends with a specific sequence in Java.
Answer: endsWith(). Tests if string terminates with given suffix.
Flashcard 18: What method converts a string to a list of words in Python?
Answer: split(). Breaks string into word array elements.
Flashcard 19: What function converts an integer to a string in JavaScript?
Answer: toString(). Converts numeric value to string representation.
Flashcard 20: Identify the method to convert a string to lowercase in Java.
Answer: toLowerCase(). Built-in method for case conversion in Java.
Flashcard 21: State the method to check if a string is empty in JavaScript.
Answer: length property or === ''. Tests length property or compares to empty.
Flashcard 22: Identify the method to capitalize the first character of a string in Python.
Answer: capitalize(). Makes first letter uppercase, rest lowercase.
Flashcard 23: What method converts a string to uppercase in JavaScript?
Answer: toUpperCase(). Converts all letters to uppercase format.
Flashcard 24: Identify the function that checks if a character is a digit in Python.
Answer: isdigit(). Returns True if character is numeric digit.
Flashcard 25: Identify the method to find a substring's last occurrence in Java.
Answer: lastIndexOf(). Finds rightmost position of substring match.
Flashcard 26: What method centers a string with a specified width in Python?
Answer: center(). Pads string with spaces for centered alignment.
Flashcard 27: What function returns the length of a string in most programming languages?
Answer: length() or len(). Standard method to count characters in a string.
Flashcard 28: What method converts a string to a float in JavaScript?
Answer: parseFloat(). Converts string to floating-point number.
Flashcard 29: State the method to get the character at a specific index in C++.
Answer: at() or []. Accesses individual character by position.
Flashcard 30: What method converts a string to uppercase in Python?
Answer: upper(). Transforms all letters to capital case.
Flashcard 31: Which method checks the equality of two strings in Java?
Answer: equals(). Compares string content for exact match.
Flashcard 32: Identify the method to find the index of a character in a string in Java.
Answer: indexOf(). Returns position of first occurrence of character.
Flashcard 33: What method centers a string with a specified width in Python?
Answer: center(). Pads string with spaces for centered alignment.
Flashcard 34: Which method concatenates two strings in Python?
Answer: The + operator. Joins strings together using addition operator.
Flashcard 35: State the method to compare two strings lexicographically in Java.
Answer: compareTo(). Performs alphabetical ordering comparison between strings.
Flashcard 36: State the method to check if a string ends with a specific sequence in Java.
Answer: endsWith(). Tests if string terminates with given suffix.
Flashcard 37: What function converts a string to a list of characters in Python?
Answer: list(). Creates list with each character as element.
Flashcard 38: Which method gets a substring from a string in JavaScript?
Answer: substring(). Extracts portion of string between indices.
Flashcard 39: What method converts a string to a float in JavaScript?
Answer: parseFloat(). Converts string to floating-point number.
Flashcard 40: Which method checks if a string contains only whitespace in Python?
Answer: isspace(). Checks if all characters are whitespace.
Flashcard 41: Identify the method to find a substring's last occurrence in Java.
Answer: lastIndexOf(). Finds rightmost position of substring match.
Flashcard 42: Find and correct the error: 'Java'.charAt(2) in Python.
Answer: Correct: 'Java'[2]. Python uses bracket notation for character access.
Flashcard 43: What function converts a string to an integer in Python?
Answer: int(). Parses string representation into integer value.
Flashcard 44: What function returns the length of a string in most programming languages?
Answer: length() or len(). Standard method to count characters in a string.
Flashcard 45: Which function creates a string from a list of characters in Python?
Answer: join(). Combines list elements into single string.
Flashcard 46: What function converts a string to an integer in Python?
Answer: int(). Parses string representation into integer value.
Flashcard 47: Which method checks if a string starts with a specific sequence in Python?
Answer: startswith(). Tests if string begins with given prefix.
Flashcard 48: Identify the method to find the index of a character in a string in Java.
Answer: indexOf(). Returns position of first occurrence of character.
Flashcard 49: Which method can reverse a string in Python?
Answer: slice with [::-1]. Extended slicing with step -1 reverses order.
Flashcard 50: What method checks if a string contains a specific substring in JavaScript?
Answer: includes(). Checks if substring exists within the string.
Flashcard 51: What method converts a string to a list of words in Python?
Answer: split(). Breaks string into word array elements.
Flashcard 52: Which method trims whitespace from both ends of a string in Python?
Answer: strip(). Removes leading and trailing whitespace characters.
Flashcard 53: Which method splits a string into an array in Python?
Answer: split(). Divides string into array elements by delimiter.
Flashcard 54: State the method to replace a substring in a string in Java.
Answer: replace(). Substitutes specified text with new text.
Flashcard 55: Identify the method that formats a string in Python.
Answer: format(). Inserts values into string template placeholders.
Flashcard 56: State the method to get the character at a specific index in C++.
Answer: at() or []. Accesses individual character by position.
Flashcard 57: Identify the method to convert a string to lowercase in Java.
Answer: toLowerCase(). Built-in method for case conversion in Java.
Flashcard 58: State the method to compare two strings lexicographically in Java.
Answer: compareTo(). Performs alphabetical ordering comparison between strings.
Flashcard 59: Identify the method that formats a string in Python.
Answer: format(). Inserts values into string template placeholders.
Flashcard 60: Which method checks if a string contains only whitespace in Python?
Answer: isspace(). Checks if all characters are whitespace.
Flashcard 61: Find and correct the error: 'Hello'.substring(0, 3) in Python.
Answer: Correct: 'Hello'[0:3]. Python uses slice notation instead of substring method.
Flashcard 62: Which method concatenates two strings in Python?
Answer: The + operator. Joins strings together using addition operator.
Flashcard 63: Which method checks if a string starts with a specific sequence in Python?
Answer: startswith(). Tests if string begins with given prefix.
Flashcard 64: What function converts a string to a float in Python?
Answer: float(). Converts string to decimal number format.
Flashcard 65: Which method checks if a string is made of alphabetic characters in Python?
Answer: isalpha(). Validates string contains only letter characters.
Flashcard 66: Which method can reverse a string in Python?
Answer: slice with [::-1]. Extended slicing with step -1 reverses order.
Flashcard 67: State the method to replace a substring in a string in Java.
Answer: replace(). Substitutes specified text with new text.
Flashcard 68: What method converts a string to uppercase in Python?
Answer: upper(). Transforms all letters to capital case.
Flashcard 69: Identify the method to encode a string to UTF-8 in Python.
Answer: encode('utf-8'). Converts string to UTF-8 byte encoding.
Flashcard 70: Which method gets a substring from a string in JavaScript?
Answer: substring(). Extracts portion of string between indices.
Flashcard 71: Find and correct the error: 'Hello'.indexOf('e') in Python.
Answer: Correct: 'Hello'.find('e'). Python uses find() instead of indexOf().
Flashcard 72: Which method trims whitespace from both ends of a string in Python?
Answer: strip(). Removes leading and trailing whitespace characters.
Flashcard 73: Find and correct the error: 'Java'.charAt(2) in Python.
Answer: Correct: 'Java'[2]. Python uses bracket notation for character access.
Flashcard 74: Which method checks if a string is made of alphabetic characters in Python?
Answer: isalpha(). Validates string contains only letter characters.