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posted @ 2020-08-31 01:33
Zhentiw
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If the data in your tables do not have integrity, meaning there are missing rows, incorrect values, or duplicate rows, your table is not worth much. D 阅读全文
posted @ 2020-08-28 19:30
Zhentiw
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Delete: delete from Users where last_name = 'clark'; If you wanted to delete everything in our table, I mentioned you could just use the delete comman 阅读全文
posted @ 2020-08-28 19:22
Zhentiw
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PostgreSQL allows you store and compare UUID values but it does not include functions for generating the UUID values in its core. Instead, it relies o 阅读全文
posted @ 2020-08-28 18:41
Zhentiw
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We can compress our cost function's two conditional cases into one case: We can fully write out our entire cost function as follows: A vectorized impl 阅读全文
posted @ 2020-08-28 04:07
Zhentiw
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In contrast to other built-ins, Arrays can be wrapped transparently: const p = new Proxy(new Array(), {}); p.push('a'); assert.equal(p.length, 1); p.l 阅读全文
posted @ 2020-08-27 02:52
Zhentiw
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Instances of most built-in constructors also use a mechanism that is not intercepted by Proxies. They therefore can’t be wrapped transparently, either 阅读全文
posted @ 2020-08-27 02:50
Zhentiw
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For a Proxy, function signature looks like: const target = {} const handler = { get(target, propKey) { return Reflect.get(target, propKey) } } const p 阅读全文
posted @ 2020-08-27 02:46
Zhentiw
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We cannot use the same cost function that we use for linear regression because the Logistic Function will cause the output to be wavy, causing many lo 阅读全文
posted @ 2020-08-26 15:52
Zhentiw
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You can have a Box element, which just used for create other element or layout: // example Box.js import styled from 'styled-components' import { spac 阅读全文
posted @ 2020-08-25 01:55
Zhentiw
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