Internet & World Wide Web: How to Program, Fifth Edition

7. JavaScript: Control Statements I

Let’s all move one place on.

—Lewis Carroll

The wheel is come full circle.

—William Shakespeare

How many apples fell on Newton’s head before he took the hint!

—Robert Frost

Objectives

In this chapter you will:

• Learn basic problem-solving techniques.

• Develop algorithms through the process of top-down, stepwise refinement.

• Use the if and if...else selection statements to choose among alternative actions.

• Use the while repetition statement to execute statements in a script repeatedly.

• Implement counter-controlled repetition and sentinel-controlled repetition.

• Use the increment, decrement and assignment operators.

Outline

7.1 Introduction

7.2 Algorithms

7.3 Pseudocode

7.4 Control Statements

7.5 if