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Matrices are 2-dimensional arrays: It's a 4*2 matrix 1 column's matrice is called Vector; % The ; denotes we are going back to a new row. A = [1, 2, 3 阅读全文
posted @ 2020-08-15 20:21
Zhentiw
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Invoke not only able to return a promise, but also a callback function with 'sendBack' & 'receive' callbacks invoke: { // nested state with id referen 阅读全文
posted @ 2020-08-13 15:56
Zhentiw
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Install: brew install postgresql Start: brew services start postgresql psql postgres Create a table: $ postgres=# create table Users ( $ postgres(# cr 阅读全文
posted @ 2020-08-12 15:40
Zhentiw
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To create a virtual path prefix (where the path does not actually exist in the file system) for files that are served by the express.static function, 阅读全文
posted @ 2020-08-12 02:50
Zhentiw
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In this lesson, we're going to show how RecoilJS selectors are used to display computed data in React. While atoms are the go-to state objects in Reco 阅读全文
posted @ 2020-08-12 02:40
Zhentiw
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Remove duplicates elements from an array is a common array task Javascript offers different alternatives to accomplish it. You can use a mix of method 阅读全文
posted @ 2020-08-12 02:34
Zhentiw
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We can measure the accuracy of our hypothesis function by using a cost function. This takes an average difference (actually a fancier version of an av 阅读全文
posted @ 2020-08-12 02:29
Zhentiw
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In this lesson, we explore creating the Egghead Shell with CSS. We explore how different properties allow us to create different shapes and how we can 阅读全文
posted @ 2020-08-10 16:30
Zhentiw
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https://www.w3schools.com/cssref/css_units.asp In this lesson, we lay the foundations for creating a CSS illustration of the Egghead logo using the "t 阅读全文
posted @ 2020-08-10 16:11
Zhentiw
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When needing to format a number I've tended to lean towards Number.prototype.toFixed(), reach for a 3rd party library, or write custom functions. Howe 阅读全文
posted @ 2020-08-10 15:57
Zhentiw
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