BiteSizedChunks.comLearn one small thing at a time.

Course contentsShow

309Basic If Statement Syntax
310The Else Clause
311Else If for Multiple Conditions
312Truthy and Falsy in Conditions
313Block Scope in If Statements
314Nested If Statements
315Guard Clauses and Early Returns
316Implicit Blocks vs Explicit Braces
317Combining Logical Operators in Conditions
318Common If/Else Antipatterns
319When to Choose If/Else Over Alternatives
320The Switch Statement Syntax
321Case Fall-Through Behavior
322Multiple Cases Sharing Code
323The Default Clause
324Switch vs If-Else Chains
325Strict Equality in Switch
326Block Scoping in Cases
327Switch with Return Statements
328Common Switch Pitfalls
329When to Prefer Object Lookups
330What Are Labeled Statements?
331Breaking Out of Nested Loops with Labels
332Continuing Outer Loops with Labeled Continue
333Labels with Blocks (Not Just Loops)
334When Labels Improve Readability vs Create Confusion
335Common Patterns: Matrix Search and Multi-Level Break
336Why Labels Are Rare in Modern JavaScript

309Basic If Statement Syntax
310The Else Clause
311Else If for Multiple Conditions
312Truthy and Falsy in Conditions
313Block Scope in If Statements
314Nested If Statements
315Guard Clauses and Early Returns
316Implicit Blocks vs Explicit Braces
317Combining Logical Operators in Conditions
318Common If/Else Antipatterns
319When to Choose If/Else Over Alternatives
320The Switch Statement Syntax
321Case Fall-Through Behavior
322Multiple Cases Sharing Code
323The Default Clause
324Switch vs If-Else Chains
325Strict Equality in Switch
326Block Scoping in Cases
327Switch with Return Statements
328Common Switch Pitfalls
329When to Prefer Object Lookups
330What Are Labeled Statements?
331Breaking Out of Nested Loops with Labels
332Continuing Outer Loops with Labeled Continue
333Labels with Blocks (Not Just Loops)
334When Labels Improve Readability vs Create Confusion
335Common Patterns: Matrix Search and Multi-Level Break
336Why Labels Are Rare in Modern JavaScript

Lesson 313 of 2,723·9. Control FlowPro lesson

Block Scope in If Statements

Explore how variables declared with let and const are scoped to if/else blocks and avoid hoisting issues.

This lesson is for subscribers

You've completed the free preview. Subscribe to unlock every lesson in every course.

See pricing Back to course