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PHP to JavaScript
Chapter project: reusable formatter pipeline
a reusable formatter pipeline Build a small pipeline that takes raw line items and returns display-ready rows plus a total. You will combine guard-style checks, pure formatters, map / filter / reduce,...
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PHP to JavaScript
Refactor: from long function to small units
One long function is hard to test; small units are easy to name A 120-line handler that validates, maps, filters, and formats is familiar in legacy PHP. The refactor is the same in JavaScript: extract pure helpers, ke...
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PHP to JavaScript
Error-first thinking in function design
Design functions so errors are obvious at the call site In PHP you often throw exceptions or return null and hope callers check. Error-first design returns a structured result: success with data, or failure with a rea...
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PHP to JavaScript
Recursion and call stack limits
Recursion is a function that calls itself PHP and JavaScript both support recursion: a function solves a smaller version of the same problem until a base case stops the chain. The engine keeps each call on the call st...
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PHP to JavaScript
Pure vs impure functions
Pure functions are predictable; impure ones touch the outside world A pure function returns the same result for the same inputs and does not change anything outside itself. PHP services are often impure (database, cac...
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PHP to JavaScript
Function composition with map, filter, and reduce
Chain small functions over arrays instead of manual loops PHP gives you array_map, array_filter, and array_reduce. Laravel adds Collection::map, filter, and reduce. JavaScript puts the same ideas on every array as met...
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PHP to JavaScript
Early returns for readable functions
Return as soon as you know the answer Some PHP style guides push a single return at the bottom of a function. Early returns are equally valid in PHP and are the default habit in many JavaScript codebases — especiall...
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PHP to JavaScript
Guard clauses to flatten nested logic
Fail fast at the top so the happy path stays flat Deep if nesting is hard to review in PHP controllers and in JavaScript handlers. Guard clauses handle invalid cases first, then leave one clear main path. PHP habit: p...
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PHP to JavaScript
bind, call, and apply for context control
bind, call, and apply fix this when the call site is wrong When a function is passed around, implicit this is lost. JavaScript gives you tools to set this explicitly — similar in spirit to carrying $this into a clos...
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PHP to JavaScript
this in normal functions: call-site rules
Regular functions get this from how they are called PHP methods always have $this when called on an object. JavaScript regular functions choose this at the call site — four common patterns, one of which bites PHP de...
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PHP to JavaScript
Arrow functions and lexical this
Arrow functions inherit this from where they are written PHP closures use use ($var) for variables. JavaScript arrows also differ from regular functions on this: they do not get a new this — they reuse the surroundi...
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PHP to JavaScript
Callback timing: who calls your function
You write the function; something else chooses when it runs Passing a function as an argument is normal in both languages. The habit to build is asking: who calls this, and before or after the next line? PHP habit: sy...
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PHP to JavaScript
Closures with real-world callback examples
Closures let inner functions remember outer variables A closure is a function that still sees variables from the scope where it was created. PHP needs use ($x); JavaScript captures automatically — essential for call...
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PHP to JavaScript
Block scope with let/const vs PHP habits
let and const stay inside the block where you declare them In PHP, a variable declared inside an if or for is still visible in the rest of the function. JavaScript let and const stop at the closing }. PHP habit <?p...
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PHP to JavaScript
Returning values vs mutating outer state
Prefer returning new data over silently changing outer state PHP services often return a result or mutate an object you pass in. JavaScript favours return values and immutable-style updates — especially with const b...
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PHP to JavaScript
Parameters, defaults, and rest arguments
Defaults and rest collect what callers pass in PHP and JavaScript both let you define default parameter values and gather extra arguments. The ... token does two jobs: rest in a parameter list, spread when calling or ...
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PHP to JavaScript
Chapter project: port a PHP utility file to JS
Port a small PHP utility class to a JavaScript module This project ties chapter 1 together: variables, strings, arrays, objects, functions, modules, and try/catch. You rewrite a PHP Formatter helper as exported functi...
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PHP to JavaScript
PHP-to-JS syntax translation drills
Translate PHP snippets to JavaScript before you paste into a file These drills recap chapter 1. Read the PHP habit, predict the JavaScript, then run the equivalent in the sandbox to confirm. Drill 1: variables PHP hab...
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PHP to JavaScript
try/catch for safer scripts
try/catch keeps failures visible instead of silent PHP and JavaScript share the same shape: try, catch, finally. The main difference is JavaScript has no typed catch — you inspect the error inside the block. PHP hab...
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PHP to JavaScript
Modules 101: export and import
One file, one module — export what you need, import what you use PHP loads files with require and brings classes into scope with use. JavaScript ES modules use export and import at the top of each file. One file is ...
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PHP to JavaScript
Function declarations vs expressions
Three ways to define a function — pick by hoisting and this PHP named functions, anonymous closures, and PHP 7.4 arrow functions map cleanly to JavaScript declarations, expressions, and arrows. PHP habit <?php fu...
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PHP to JavaScript
Object basics: keys, values, and access
Objects hold keyed data — PHP associative arrays, different syntax When you reach for ['key' => 'value'] in PHP, you usually want a JavaScript object. Property access uses dots for fixed keys and brackets for dyn...
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PHP to JavaScript
Array basics: create, read, update safely
Arrays are lists — create, read, and update without surprises PHP arrays double as lists and maps. JavaScript arrays are ordered lists only. Associative data belongs in objects (next lesson). PHP habit: building and...
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PHP to JavaScript
Loop choices: for, while, for...of
Pick the loop that matches the data shape PHP’s foreach is your daily driver. JavaScript adds for...of for the same job, keeps the classic for index loop, and has for...in only for object keys — not for arrays. PH...
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PHP to JavaScript
Nullish coalescing and optional chaining
Safe defaults without throwing on nested data PHP 7.4 gave you ??. PHP 8 gave you ?->. JavaScript has the same pair: ?? for nullish defaults and ?. for optional chaining. Together they replace long isset chains. PH...
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PHP to JavaScript
if, ternary, and switch for clear branching
Branching syntax you already know from PHP if, ternary, and switch look almost the same in JavaScript. The differences are small: else if is two words, and switch still needs break to avoid fall-through. PHP habit: if...
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PHP to JavaScript
Equality done right: === over ==
Use === the same way you learned in modern PHP If you already prefer === in PHP, keep that habit in JavaScript. Loose == exists in both languages and surprises people who expect “same value” without remembering co...
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PHP to JavaScript
Truthy/falsy values that surprise PHP devs
Truthy and falsy decide if before you expect it PHP’s if ($value) and JavaScript’s if (value) both test “is this value usable in a condition?” but JavaScript’s list of falsy values is longer and stricter com...
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PHP to JavaScript
Numbers, parsing, and NaN handling
One number type, many conversion traps PHP separates int and float. JavaScript uses one number type. Parsing and NaN behave like PHP’s (int) / intval / floatval, with a few gotchas worth seeing side by side. PHP hab...
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PHP to JavaScript
Strings and template literals
Backticks are PHP double-quotes with superpowers String work in PHP is mostly functions (strlen, strtoupper, str_contains). In JavaScript the string is an object with methods, and backticks give you interpolation like...
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PHP to JavaScript
Primitive types and typeof in practice
Five values you will log every week PHP’s type helpers (is_string, is_int, is_null) map cleanly to JavaScript once you know the small differences: one number type, and an extra empty value called undefined. PHP habi...
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PHP to JavaScript
let, const, and why var causes bugs
Pick const first, let when the value must change You already declare variables all day in PHP. JavaScript does the same job with different syntax: no $, and a keyword that signals whether the name can be reassigned. P...
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Browse the library

Topics

Courses

Chapter project: reusable formatter pipeline

Refactor: from long function to small units

Error-first thinking in function design

Recursion and call stack limits

Pure vs impure functions

Function composition with map, filter, and reduce

Early returns for readable functions

Guard clauses to flatten nested logic

bind, call, and apply for context control

this in normal functions: call-site rules

Arrow functions and lexical this

Callback timing: who calls your function

Closures with real-world callback examples

Block scope with let/const vs PHP habits

Returning values vs mutating outer state

Parameters, defaults, and rest arguments

Chapter project: port a PHP utility file to JS

PHP-to-JS syntax translation drills

try/catch for safer scripts

Modules 101: export and import

Function declarations vs expressions

Object basics: keys, values, and access

Array basics: create, read, update safely

Loop choices: for, while, for...of

Nullish coalescing and optional chaining

if, ternary, and switch for clear branching

Equality done right: === over ==

Truthy/falsy values that surprise PHP devs

Numbers, parsing, and NaN handling

Strings and template literals

Primitive types and typeof in practice

let, const, and why var causes bugs