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Syntax Essentials

Variables by assignment String interpolation Arrays Objects Existential operator ? Soaked access ?. Ranges Destructuring assignment Splats Comments

Functions

Function arrow -> Bound arrow => Implicit return Default parameters Rest parameters Named functions Higher-order functions IIFE with do Function composition Callbacks

Control Flow

if expression unless postfix if switch while until loop break continue try catch finally

Iteration

for in arrays for of objects Comprehensions Filtered comprehensions Index in comprehension Object key and value Range iteration by step own property iteration Array mapping comprehension

Classes

class declaration constructor Instance methods Static methods extends super Bound instance methods Prototype access :: Class properties Mixins with object assignment

Operators

is and isnt and or not in operator of operator Chained comparisons Floor division // Modulo %% Exponentiation ** Assignment operators Nullish assignment ?=

JavaScript Interop

Embedded JavaScript require modules ES module import ES module export Promise usage async functions await JSON parsing DOM querySelector Event listeners

Patterns & Practical Code

Memoization Guard clauses Object defaults Optional callbacks Configuration merge Grouping values Flattening arrays Unique values Sorting objects Error wrapping

CoffeeScript Complete Course / Operators

Assignment operators

Learn Assignment operators in CoffeeScript with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.

12 min read • Intermediate

Assignment operators is an atomic CoffeeScript topic inside Operators. The example below uses the actual construct named by the lesson rather than a generic placeholder.

Focus on what Assignment operators changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.

Topic-specific example

coffeescript-06-09-assignment-operators.coffee

coffeescript Try It Live

n=5
n += 3
n *= 2
console.log n

Edge case / engineering note

Change the key input in this CoffeeScript example and predict the result first; the named construct should be the reason the behavior changes.

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Assignment operators Mastery Check →

Exponentiation **

Nullish assignment ?=