Updated select to get

This commit is contained in:
Angelos Chalaris
2018-01-18 17:40:42 +02:00
parent c07cd0dc36
commit 82eb3e59a7
6 changed files with 45 additions and 34 deletions

21
snippets/get.md Normal file
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### get
Retrieve a set of properties indicated by the given selectors from an object.
Use `Array.map()` for each selector, `String.replace()` to replace square brackets with dots, `String.split('.')` to split each selector, `Array.filter()` to remove empty values and `Array.reduce()` to get the value indicated by it.
```js
const get = (from, ...selectors) =>
[...selectors].map(s =>
s
.replace(/\[([^\[\]]*)\]/g, '.$1.')
.split('.')
.filter(t => t !== '')
.reduce((prev, cur) => prev && prev[cur], from)
);
```
```js
const obj = { selector: { to: { val: 'val to select' } }, target: [1, 2, {a: 'test'}] };
get(obj, 'selector.to.val', 'target[0]', 'target[2].a'); // ['val to select', 1, 'test']
```

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### select
Retrieve a set of properties indicated by the given selectors from an object.
Use `Array.map()` for each selector, `String.split('.')` to split each selector and `Array.reduce()` to get the value indicated by it.
```js
const select = (from, ...selectors) =>
[...selectors].map(s => s.split('.').reduce((prev, cur) => prev && prev[cur], from));
```
```js
const obj = { selector: { to: { val: 'val to select' } } };
select(obj, 'selector.to.val'); // ['val to select']
select(obj, 'selector.to.val', 'selector.to'); // ['val to select', { val: 'val to select' }]
```

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test/get/get.js Normal file
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const get = (from, ...selectors) =>
[...selectors].map(s =>
s
.replace(/\[([^\[\]]*)\]/g, '.$1.')
.split('.')
.filter(t => t !== '')
.reduce((prev, cur) => prev && prev[cur], from)
);
module.exports = get

15
test/get/get.test.js Normal file
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const test = require('tape');
const get = require('./get.js');
test('Testing get', (t) => {
//For more information on all the methods supported by tape
//Please go to https://github.com/substack/tape
t.true(typeof get === 'function', 'get is a Function');
const obj = { selector: { to: { val: 'val to get' } } };
t.deepEqual(get(obj, 'selector.to.val'), ['val to get'], "Retrieve a property indicated by the selector from an object.");
//t.deepEqual(get(args..), 'Expected');
//t.equal(get(args..), 'Expected');
//t.false(get(args..), 'Expected');
//t.throws(get(args..), 'Expected');
t.end();
});

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const select = (from, ...selectors) =>
[...selectors].map(s => s.split('.').reduce((prev, cur) => prev && prev[cur], from));
module.exports = select

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const test = require('tape');
const select = require('./select.js');
test('Testing select', (t) => {
//For more information on all the methods supported by tape
//Please go to https://github.com/substack/tape
t.true(typeof select === 'function', 'select is a Function');
const obj = { selector: { to: { val: 'val to select' } } };
t.deepEqual(select(obj, 'selector.to.val'), ['val to select'], "Retrieve a property indicated by the selector from an object.");
//t.deepEqual(select(args..), 'Expected');
//t.equal(select(args..), 'Expected');
//t.false(select(args..), 'Expected');
//t.throws(select(args..), 'Expected');
t.end();
});