Class-7

Class 7 – Introduction to JavaScript

Slides: Class7.pptx

String Functions and Date Object

String Functions In this lecture, we cover various string manipulation functions essential for JavaScript development:

• toLowerCase() and toUpperCase(): Convert strings to lower or upper case respectively, useful for comparing user inputs.
• slice(): Extracts a part of a string and returns it as a new string. It can take positive or negative indices to define the range.
• indexOf() and lastIndexOf(): Return the index of the first or last occurrence of a specified text within a string. They support optional arguments to specify the starting point of the search.
• charAt(): Returns the character at a specified index within a string.
• replace(): Replaces specified values within a string with another value, using regular expressions for case-insensitive and global replacements.
• split(): Splits a string into an array of substrings based on a specified delimiter, such as spaces, commas, or pipes.

Date Object We also explore the Date object in JavaScript, which is crucial for managing date and time in applications:

• Creating Date Objects: Several ways to create Date objects, including using the current date, specific dates, and timestamps.
• Unix Time: Understanding how JavaScript measures time from the Unix epoch (January 1, 1970).
• Retrieving and Modifying Date Components: Using various methods to get and set parts of a date, like year, month, day, hours, minutes, and seconds.
• Calculating Time Differences: Techniques to calculate the difference between two dates in days using the getTime() method and converting milliseconds into days.

This lecture provides essential knowledge on string manipulation and date management in JavaScript, laying a solid foundation for building dynamic and interactive web applications.