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JavaScript concepts through practical coding challenges.\n\n## Problems List\n\n### **Closures**\n| Day | Problem | Difficulty | Status | Concepts |\n|-----|---------|------------|---------|-----------|\n| 1 | [Create Hello World Function](day-01-create-hello-world/) | Easy | ✅ Completed | Higher-order functions, closures |\n| 2 | [Counter](day-02-counter/) | Easy | ✅ Completed | Closures, state management |\n| 3 | [To Be Or Not To Be](day-03-to-be-or-not-to-be/) | Easy | ✅ Completed | Type checking, function returns |\n| 4 | [Counter II](day-04-counter-ii/) | Easy | ✅ Completed | Object methods, closures |\n\n### **Basic Array Transformations**\n| Day | Problem | Difficulty | Status | Concepts |\n|-----|---------|------------|---------|-----------|\n| 5 | [Apply Transform Over Each Element in Array](day-05-apply-transform/) | Easy | ✅ Completed | Array.map(), callbacks |\n| 6 | [Filter Elements from Array](day-06-filter-elements/) | Easy | ✅ Completed | Array.filter(), conditional logic |\n| 7 | [Array Reduce Transformation](day-07-array-reduce/) | Easy | ✅ Completed | Array.reduce(), accumulators |\n\n### **Function Transformations**\n| Day | Problem | Difficulty | Status | Concepts |\n|-----|---------|------------|---------|-----------|\n| 8 | [Function Composition](day-08-function-composition/) | Easy | ✅ Completed | Function composition, reduceRight |\n| 9 | [Return Length of Arguments Passed](day-09-arguments-length/) | Easy | ✅ Completed | Rest parameters, arguments object |\n| 10 | [Allow One Function Call](day-10-allow-one-call/) | Easy | ✅ Completed | Function calls, once wrapper |\n| 11 | [Memoize](day-11-memoize/) | Medium | ✅ Completed | Caching, memoization, Map |\n\n### **Promises and Time**\n| Day | Problem | Difficulty | Status | Concepts |\n|-----|---------|------------|---------|-----------|\n| 12 | [Add Two Promises](day-12-add-two-promises/) | Easy | ✅ Completed | Promise.all(), async/await |\n| 13 | [Sleep](day-13-sleep/) | Easy | ✅ Completed | setTimeout, Promise constructor |\n| 14 | [Timeout Cancellation](day-14-timeout-cancellation/) | Easy | ✅ Completed | clearTimeout, cancellation |\n| 15 | [Interval Cancellation](day-15-interval-cancellation/) | Easy | ✅ Completed | setInterval, clearInterval |\n| 16 | [Promise Time Limit](day-16-promise-time-limit/) | Medium | ✅ Completed | Promise.race(), timeout |\n| 17 | [Cache With Time Limit](day-17-cache-time-limit/) | Medium | ✅ Completed | Time-based caching, Map |\n| 18 | [Debounce](day-18-debounce/) | Medium | ✅ Completed | Debouncing, setTimeout |\n| 19 | [Execute Asynchronous Functions in Parallel](day-19-async-parallel/) | Medium | ✅ Completed | Promise.all(), error handling |\n\n### **JSON and Array Methods**\n| Day | Problem | Difficulty | Status | Concepts |\n|-----|---------|------------|---------|-----------|\n| 20 | [Is Object Empty](day-20-is-object-empty/) | Easy | ✅ Completed | Object inspection, keys |\n| 21 | [Chunk Array](day-21-chunk-array/) | Easy | ✅ Completed | Array chunking, slicing |\n| 22 | [Array Prototype Last](day-22-array-last/) | Easy | ✅ Completed | Array methods, prototypes |\n| 23 | [Group By](day-23-group-by/) | Medium | ✅ Completed | Array grouping, reduce |\n| 24 | [Sort By](day-24-sort-by/) | Easy | ✅ Completed | Custom sorting, comparators |\n| 25 | [Join Two Arrays by ID](day-25-join-arrays/) | Medium | ✅ Completed | Array merging, objects |\n| 26 | [Flatten Deeply Nested Array](day-26-flatten-array/) | Medium | ✅ Completed | Recursion, array flattening |\n| 27 | [Compact Object](day-27-compact-object/) | Medium | ✅ Completed | Object filtering, recursion |\n\n### **Classes**\n| Day | Problem | Difficulty | Status | Concepts |\n|-----|---------|------------|---------|-----------|\n| 28 | [Event Emitter](day-28-event-emitter/) | Medium | ✅ Completed | Event handling, subscribers |\n| 29 | [Array Wrapper](day-29-array-wrapper/) | Easy | ✅ Completed | Classes, valueOf, toString |\n| 30 | [Calculator with Method Chaining](day-30-calculator-chaining/) | Easy | ✅ Completed | Method chaining, classes |","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdiogocarrola%2Fleetcode-js-30-days","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdiogocarrola%2Fleetcode-js-30-days","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdiogocarrola%2Fleetcode-js-30-days/lists"}