JS by Ear

17 — Fetch and JSON — Talking to Web APIs

Understand the two stages of fetching data: receiving a response, checking its status, and parsing JSON. Compare HTTP errors, network failures, and malformed JSON, then e

18 — JavaScript Modules — Organizing a Small App

Organize a small JavaScript app with named exports, imports, and module-local scope. Follow a workout calculator and loader across three files, understand shared module s

16 — The Event Loop — Tasks, Microtasks, and Execution Order

Follow tasks, microtasks, and the event loop to predict the order of asynchronous JavaScript code. An audio-first JavaScript study conversation with worked examples, pau

15 — Async and Await — Readable Code Without Blocking

Learn how async and await organize promise-based code without blocking JavaScript execution. An audio-first JavaScript study conversation with worked examples, pause-and

14 — Promise Chains — Errors and Concurrent Operations

Trace promise chains, error propagation, cleanup, and concurrent asynchronous operations. An audio-first JavaScript study conversation with worked examples, pause-and-pr

13 — Promise Basics — From Callbacks to Future Results

Understand promises as future results, including pending, fulfilled, and rejected states and how handlers receive values. An audio-first JavaScript study conversation wi

12 — Higher-Order Functions — Connecting the Ideas

Connect callbacks, closures, and higher-order functions through functions that accept or return other functions. An audio-first JavaScript study conversation with worked

11 — Closures — Practical Uses and Common Mistakes

Explore practical closures and common mistakes, including shared state and functions that retain access to outer variables. An audio-first JavaScript study conversation

10 — Functions — Deeper Understanding with MDN

Deepen your understanding of JavaScript functions, scope, arguments, and execution using MDN as a reference. An audio-first JavaScript study conversation with worked exa

09 — Callbacks and Execution Order

Trace callback execution step by step and distinguish passing a function from calling it. An audio-first JavaScript study conversation with worked examples, pause-and-pr

08 — Scope and Closures — The Mental Model

Build a mental model of lexical scope and closures, including what a function remembers from its surrounding scope. An audio-first JavaScript study conversation with wor

07 — Array Methods — Sorting and Utilities

Understand sorting, numeric comparators, array utilities, and common mutation traps. An audio-first JavaScript study conversation with worked examples, pause-and-predict

06 — Array Methods — forEach, map, filter, and reduce

Compare forEach, map, filter, and reduce by tracing callbacks, return values, and results. An audio-first JavaScript study conversation with worked examples, pause-and-p

05 — Array Methods — Adding, Removing, Copying, and Searching

Learn how JavaScript arrays add, remove, copy, and search for items, and which methods change the original array. An audio-first JavaScript study conversation with worke

04 — Object References, Mutation, and Copying

Explore object references, shared mutation, shallow copies, and nested objects with small examples. An audio-first JavaScript study conversation with worked examples, pa

03 — Objects and Properties

Build and update a workout object while learning properties, dot and bracket notation, computed keys, and missing values. An audio-first JavaScript study conversation wi

02 — Function Expressions and Functions as Values

Understand functions as values: declarations versus expressions, referring to a function versus calling it, and passing functions as callbacks. An audio-first JavaScript

01 — Function Basics

Learn how JavaScript functions execute: defining and calling functions, parameters and arguments, local variables, defaults, and return values. Follow a workout-volume ca