Control Flow, Functions & First-Class Citizens
Master modern execution branching: guard clause design patterns, the three function syntaxes, parameter destructuring, and functional composition.
Familiarity with types, conditionals, and variables.
Write elegant branching logic with guard clauses, master all 3 function styles, and compose higher-order functions.
Read in order, or jump to what you need.
Every lesson builds on the one before it. Open any lesson to read the explanation, run the examples, and try the practice challenges.
- 03.01Control Flow: Guard Clauses, Ternaries & Eliminating Nested Conditionals4 min
Deconstruct conditional branching. Learn to replace arrow anti-patterns and deeply nested if/else pyramids with fail-fast guard clauses and table lookups.
- 03.02Function Architectures: Declarations, Expressions, Arrows & Tail Call Semantics4 min
Examine the three fundamental ways to define functions in JavaScript. Master hoisting differences, constructor abilities, arguments object access, and lexical this binding.
- 03.03Parameter Mechanics: Default Values, Rest, Spread & Advanced Destructuring4 min
Harness modern parameter syntax. Master default argument evaluation, rest parameters, the spread operator, deep object destructuring, and property aliases.
- 03.04First-Class Citizens: Higher-Order Functions, Callbacks & Functional Composition4 min
Unlock functional programming in JavaScript. Understand functions as first-class values, build higher-order functions, and assemble reusable pipelines using compose and pipe.
Ready to move on?
Refactor nested conditional logic into pure, composable function pipelines.
Open the module self-check