25 micro-topics in Programming Languages, each with the evidence that proves you have it and the written reason behind every link. Before you start, it rests on 1 other domain. Downstream, it holds up 10 domains.
25 topics · depth 0–7 of 16 · 31 internal links · 1 in · 16 out
Load-bearing links first. Each one says what in this domain rests on what outside it, and why.
1 link
Organize code into modules rests on Annotate types
Type-aware imports are easier once annotations exist.
In prerequisite order. Each idea names the artifact that closes it, the market demand that put it on the map, and what it stands on.
Depth 0 · conceptual · unassisted · M05 §4.1
Chooses const, let and knows why not var
Depth 1 · conceptual · unassisted · M05 §4.1
Predicts what == and typeof will do
Declare variables deliberately
Types describe what variables hold.
Depth 1 · procedural · unassisted · M05 §4.5
Applies mutating and non-mutating methods
Declare variables deliberately
An array is a value bound to a name.
Depth 1 · procedural · unassisted · M05 §4.6
Creates, accesses, and iterates key-value data
Declare variables deliberately
An object is a value bound to a name.
Depth 2 · procedural · unassisted · M05 §4.1
Applies template literals and string methods
Reason about primitive types and coercion
Strings are a primitive type.
Depth 2 · procedural · unassisted · M05 §4.2
Applies comparison, logical and ternary operators
Reason about primitive types and coercion
Operator behavior depends on types.
Depth 2 · procedural · unassisted · M05 §4.6
Pulls values out and copies structures
Destructuring pulls values out of objects and arrays.
Destructuring pulls values out of objects and arrays.
Depth 2 · conceptual · unassisted · M09 §9.3
Models behavior with classes where it fits
A class is a template for objects.
Depth 3 · procedural · unassisted · M05 §4.3
Applies if, switch, for, while, break and continue
Conditions are expressions.
Depth 3 · conceptual · scaffolded · M09 §9.3
Updates without mutating shared state
Immutability is about how you update structures.
Spread is the tool for non-mutating updates.
Depth 4 · procedural · unassisted · M05 §4.4
Declares, parameterizes and returns
Control flow with conditionals and loops
Functions contain the control flow you can already write.
Depth 5 · conceptual · unassisted · M05 §4.4
Knows how binding differs
Arrow functions are an alternate form.
Depth 5 · conceptual · unassisted · M05 §4.4
Predicts where a binding is visible
Scope is created by functions.
Depth 5 · conceptual · unassisted · M05 §4.5
Expresses transformations declaratively
These are array methods.
They take functions as arguments.
Depth 5 · procedural · unassisted · M05 §4.8
Applies try, catch, finally and throws typed errors
Errors propagate out of function calls.
Depth 5 · procedural · unassisted · M05 §4.9
Uses setTimeout and setInterval correctly
Timers take callbacks.
Depth 5 · conceptual · unassisted · M05 §4.9
Creates, chains and settles asynchronous values
A promise wraps a deferred function result.
Callback pain is what motivates promises.
Depth 5 · representational · unassisted · M09 §9.3
Imports and exports, statically and dynamically
Modules export functions and values.
Annotate types · TypeScript Types
Type-aware imports are easier once annotations exist.
Depth 5 · conceptual · scaffolded · M09 §9.3
Passes and returns functions
Higher-order functions take and return functions.
Transform with map, filter and reduce
These methods are the first higher-order functions you meet.
Depth 6 · conceptual · scaffolded · M05 §4.4
Captures state in a returned function
Reason about scope and hoisting
A closure captures its enclosing scope.
Depth 6 · meta · unassisted · M05 §4.8
Locates the origin of a runtime failure
A trace is a record of calls that threw.
Depth 6 · procedural · unassisted · M05 §4.9
Expresses asynchronous flow linearly
Await consumes promises.
Depth 6 · conceptual · scaffolded · M09 §9.2
Applies Promise.all, race and allSettled
These are promise combinators.
Depth 7 · procedural · unassisted · M05 §4.9
Uses fetch with methods, headers and bodies
Fetch returns a promise.
Requests and responses are objects.
Depth 7 · conceptual · guided · M09 §9.2
Produces values lazily and asynchronously
Async iteration builds on await.
Control flow with conditionals and loops
A generator is a function whose loop yields.
Everything downstream that names an idea here as a prerequisite, grouped by where it lives.
3 links
Solve array and string problems rests on Manipulate arrays
Array problems require array manipulation.
Solve problems with hash maps and sets rests on Work with objects
Hash-based solutions use objects and maps.
Think recursively rests on Write and call functions
Recursion is a function calling itself.
4 links
Compose components rests on Write and call functions
A component is a function that returns markup.
Synchronize with effects rests on Write async and await
Fetching inside an effect is asynchronous.
Handle errors at component boundaries rests on Handle errors
Boundaries handle thrown errors.
Manage component state rests on Use closures
Hook behavior makes more sense once closures do.
2 links
Annotate types rests on Reason about primitive types and coercion
You annotate the types JavaScript already has.
Narrow types rests on Control flow with conditionals and loops
Narrowing follows control flow.
1 link
Consume server-sent events in the browser rests on Write async and await
Stream consumption is asynchronous iteration.
1 link
Select elements from script rests on Write and call functions
DOM APIs are function calls.
1 link
Fetch data on the server rests on Call HTTP APIs from JavaScript
Server fetching is the same API in a different place.
1 link
Unit test JavaScript rests on Write and call functions
You unit test functions.
1 link
Explain the request-response model rests on Call HTTP APIs from JavaScript
You have already made requests; this names what happened.
1 link
Write async Python rests on Write async and await
The await model transfers between languages.
1 link
Reason about the testing pyramid rests on Write and call functions
Test placement is easier once you have code worth testing.
Retool. Retrain. Relaunch.
375 ideas. 17 weeks. No tuition, ever.
Vets Who Code is a veteran-run 501(c)(3). The accelerator is free, remote, and we don’t take a share of your first paycheck.
Free · Remote · 17 weeks · EIN 86-2122804