随笔分类 - Javascript
摘要：Values assigned with let and const are seen everywhere in JavaScript. It's become common to hear them explained like so: "const creates an constant (i
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摘要：function solution( tags = ['ul', 'ol']) { const [uls, ols] = tags.map(tag => Array.from($(`${tag}`))); const [logUl, logOl] = tags.map(tag => new Logg
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摘要：JavaScript provides primitive types and means of processing those. However, those are not enough. Real data must somehow come into the program and dat
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摘要：Functions are first class in JavaScript. This means we can treat a function like any other data. This also means we can end up with a function as the
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摘要：The alt method allows us to recover from a nothing with a default Maybe, but sometimes our recovery efforts might need to enlist some logic to recover
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摘要：Once we’re using Maybes throughout our code, it stands to reason that at some point we’ll get a Maybe and want to continue applying transformations. W
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摘要：Sometimes, we run into situations where we end up with a Maybe within the context of another Maybe. Nested structures like this can get really confusi
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摘要：In this lesson, we’ll look at the propPath utility function. We’ll ask for a property multiple levels deep in an object and get back a Maybe. We’ll ge
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摘要：In this lesson, we’ll use a Maybe to safely operate on properties of an object that could be undefined. We’ll use our initial code as the basis for a
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摘要：In this lesson, we’ll create a safe function that gives us a flexible way to create Maybes based on a value and a predicate function that we supply. W
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摘要：In this lesson, we’ll get started with the Maybe type. We’ll look at the underlying Just and Nothing types and create a simple utility function to cre
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摘要：When it comes to websites performance is king. How long it takes for a page to load can mean the difference of millions of dollars for large ecommerce
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摘要：// Asynchronous iteration --> Symbol.asyncIterator async function main() { const syncIterable = [ Promise.resolve('a'), Promise.resolve('b'), ]; for await (const x of sync...
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摘要：Hyperapp is an ultra lightweight (1kb), minimal, functional, JavaScript library for building UIs. It comes with a VDOM engine and state management wit
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摘要：Hyperapp is an ultra lightweight (1kb), minimal, functional, JavaScript library for building UIs. It comes with a VDOM engine and state management wit
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摘要：We can execute generators from generators, and delegate the iteration control with the yield* keyword. Yo dawg, I heard you like generators, so I put
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摘要：ES2017 added two new string functions. They are padStart and padEndfunctions. In this lesson, we will understand how to use these functions and a few
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摘要：In Javascript, all function arguments are optional by default. That means if you ever forget to pass a critical parameter, the code will just fail wit
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摘要：Transducers remove the requirement of being lazy to optimize for things like take(10). However, it can still be useful to "bind" a collection to a set
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摘要：A frequent use case when transducing is to apply a transformation to items without changing the type of the collection. In this lesson, we'll create a
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