28 JavaScript Skills a Qualified Intermediate Front-End Engineer Needs to Master

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• [x] Array Api
• [x] Use reduce to implement the array Api
• [x] Implement class of ES6 by ES5
• [x] Curry/Partial function
• [x] Throttling/Debounce function
• [x] Fibonacci sequence
• [x] Publish and subscribe
• [x] Bind and call
• [x] Co(generator)
• [x] Lazy loading of images
• [x] new
• [x] Object.assign
• [x] instanceof
• [x] Private variables
• [x] Shuffling algorithm
• [x] Singleton mode
• [x] Promisify
• [x] Handles async/await gracefully
• [x] JSON.stringify
• [x] Implement koa-compose
• [x] Promise Api(Promise.all, Promise.race, Promise.finally)