28 JavaScript Skills that a Front-End Engineer Needs to Master

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