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Numeric Operations

• sum(a: number, b: number): number: Adds two numbers.
• subtract(a: number, b: number): number: Subtracts b from a.
• multiply(a: number, b: number): number: Multiplies two numbers.
• divide(a: number, b: number): number | string: Divides a by b. Returns 'Cannot divide by zero' if b is 0.
• square(a: number): number: Returns the square of a.
• cube(a: number): number: Returns the cube of a.
• isEven(a: number): boolean: Checks if a is even.
• isOdd(a: number): boolean: Checks if a is odd.

String Operations

• capitalize(str: string): string: Capitalizes the first letter of a string.
• reverse(str: string): string: Reverses the characters of a string.
• length(str: string): number: Returns the length of a string.
• countWords(str: string): number: Counts the number of words in a string.
• replaceVowels(str: string): string: Replaces vowels in a string with '*'.
• toUpperCase(str: string): string: Converts a string to uppercase.
• toLowerCase(str: string): string: Converts a string to lowercase.