JS MASTER CLASS /// CONTROL THE FLOW /// IF ELSE /// FOR LOOPS /// JS MASTER CLASS /// CONTROL THE FLOW /// IF ELSE /// FOR LOOPS ///

JS Control Structure

Take command of your algorithm. Learn to direct the execution flow using sequences, conditional logic, and iterations.

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A.D.A:Programs are like recipes. Without structure, they just run from top to bottom. Control Structures allow us to change the flow of execution based on conditions.


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Concept: Sequence

Code runs top-to-bottom unless told otherwise. It's the most basic control structure.

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How are standard statements executed in JS?

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JavaScript Control Structures

Author

Pascual Vila

Fullstack Instructor // Code Syllabus

A program is fundamentally a set of instructions. Without control structures, the computer executes these instructions linearly, from top to bottom. Control structures are blocks of code that dictate the flow of execution based on logic and conditions.

Sequential Execution

This is the default mode. The JavaScript engine reads your code line by line. It executes line 1, then line 2, and so on. Understanding this is crucial because the state of your application changes sequentially.

Selection (Conditionals)

Selection structures allow the program to make decisions. The most common is the if/else statement. It evaluates a boolean expression (true or false) and branches the execution path accordingly. Another option is the switch statement, useful when evaluating a single variable against many potential exact values.

Iteration (Loops)

Iteration allows you to repeat a block of code multiple times without rewriting it.

- The for loop is excellent when you know exactly how many times you want to loop.
- The while loop is better when you want to loop until a specific condition becomes false, regardless of the number of iterations.

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In this module, we dissect how algorithms are built. An algorithm is just a combination of Sequence, Selection, and Iteration. We explore nested if statements, the dangers of infinite while loops, and how to use 'break' and 'continue' keywords to further control loop execution flows.

JS Control Glossary

Control Structure

A block of code that analyzes variables and chooses a direction in which to go based on given parameters.

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If Statement (Selection)

Executes a block of code if a specified condition is true.

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Else If / Else

Provides alternative branches if the initial 'if' condition is false.

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For Loop (Iteration)

Repeats a block of code a known number of times. Contains setup, condition, and increment.

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While Loop

Repeats a block of code as long as a specified condition is true. Watch out for infinite loops!

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Switch Statement

Evaluates an expression, matching the expression's value to a case clause, and executes statements associated with that case.

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