© Varun Singh
While Loops - While writing a program, you may encounter a situation where you need to perform an action over and over again.
The for...in loop is used to loop through an objects properties. As we have not discussed Objects yet, you may not feel comfortable with this loop.
A function is a group of reusable code which can be called anywhere in your program. This eliminates the need of writing the same code again and again.
You might have encountered a situation where you clicked a URL to reach a page X but internally you were directed to another page Y.
The Boolean object represents two values, either true or false. If value parameter is omitted or is 0, -0, null, false, NaN, undefined.
The Array object lets you store multiple values in a single variable. It stores a fixed-size sequential collection of elements of the same type.
The Math Object - The math object provides you properties and methods for mathematical constants and functions.