随笔分类 - TypeScript
摘要：TypeScript tries to infer as much about your code as it can. But sometimes there really is not enough context for it to infer reliably. If it tried to
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摘要：Function Type: Interface:
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摘要：Example 1: A never stop while loop return a never type. Example 2: Never run If block You can use this to do exhaustive checks in union types. For exa
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摘要：Observable.prototype.debug = function(message: any) { return this.do( (next) => { if(!environment.production) { console.log(message, next); } }, (err) => { ...
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摘要：this is probably the most tricky thing to use in JavaScript and therefore TypeScript. Fortunately there is a TypeScript compiler flag noImplicit this
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摘要：Learn how to write a promise based delay function and then use it in async await to see how much it simplifies code over setTimeout. Lets say you want
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摘要：It can be painful to write the same function repeatedly with different types. Typescript generics allow us to write 1 function and maintain whatever t
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摘要：Sometimes the compiler needs help figuring out a type. In this lesson we learn how to help out the compiler with Typescript type assertion. We have a
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摘要：Typescript classes make inheritance much easier to write and understand. In this lesson we look into how to set up inheritance with Typescript classes
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摘要：Typescript classes make traditional object oriented programming easier to read and write. In this lesson we learn about class syntax, what the constru
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摘要：It’s easy to pass the wrong value to a function. Typescript interfaces are great because they catch errors at compile time or in an IDE. In this lesso
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摘要：In JavaScript, many libraries use string arguments to change behavior. In this lesson we learn how Typescript catches string related errors at compile
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摘要：When to use Interface and when to use Class. Let's see one example: We have an Interface 'Lesson' and a Class 'Lesson'. At this point, I would love to
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摘要：Sometimes we want our function arguments to be able to accept more than 1 type; e.g. a string or an array. This lesson will show us how to assign more
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摘要：It's common in Javascript for functions to accept different argument types and to also return different types. In this lesson we learn how to 'teach'
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摘要：First, what is 'High Order function', basic just a function, inside the function return another fuction. For example: Decorators is a subset of high o
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摘要：TypeScript allows you to generate definition files for your own libraries. This lesson shows you how to organize your project and generate the definit
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摘要：When multiple decorators apply to a single declaration, their evaluation is similar to function composition in mathematics. In this model, when compos
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摘要：TypeScript allows you to emit decorator metadata which enables more powerful features through reflection. This lesson show you how decorators and refl
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摘要：Decorators are a feature of TypeScript that are becoming more and more common in many major libraries. This lesson walks you through what decorators a
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