¿Cómo filtrar las teclas de un objeto con lodash?
Tengo un objeto con algunas claves, y quiero mantener solo algunas de las claves con su valor?
Lo intenté con filter
:
var data = {
"aaa":111,
"abb":222,
"bbb":333
};
var result = _.filter(data, function(value, key) {
return key.startsWith("a");
})
console.log(result);
Pero imprime una matriz:
[111, 222]
Que no es lo Que quiero.
¿Cómo hacerlo con lodash? ¿O algo más si Lodash no funciona?
Demostración en vivo: http://jsbin.com/moqufevigo/1/edit?js, output
128
4 answers
Lodash tiene un _.pickBy
la función que hace exactamente lo que estás buscando.
var thing = {
"a": 123,
"b": 456,
"abc": 6789
};
var result = _.pickBy(thing, function(value, key) {
return _.startsWith(key, "a");
});
console.log(result.abc) // 6789
console.log(result.b) // undefined
<script src="https://cdn.jsdelivr.net/lodash/4.16.4/lodash.min.js"></script>
193
Author: serg10,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-10-31 06:48:16
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-10-31 06:48:16
Simplemente cambia el filtro a omitBy
var result = _.omitBy(data, function(value, key) {
return !key.startsWith("a");
})
27
Author: Krystian Jankowski,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-11-16 19:54:19
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-11-16 19:54:19
Aquí hay un ejemplo usando lodash
4.x:
var data = {
"aaa":111,
"abb":222,
"bbb":333
};
var result = _.pickBy(data, function(value, key) {
return key.startsWith("a");
});
console.log(result);
// Object {aaa: 111, abb: 222}
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.min.js"></script>
<strong>Open your javascript console to see the output.</strong>
13
Author: PaulMest,
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2016-08-09 22:57:57
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2016-08-09 22:57:57
Una forma no lodash de resolver esto de una manera bastante legible y eficiente:
function filterByKeys(obj, keys = []) {
const filtered = {}
keys.forEach(key => {
if (obj.hasOwnProperty(key)) {
filtered[key] = obj[key]
}
})
return filtered
}
const myObject = {
a: 1,
b: 'bananas',
d: null
}
filterByKeys(myObject, ['a', 'd', 'e']) // {a: 1, d: null}
0
Author: thomax,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2018-09-24 07:25:35
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2018-09-24 07:25:35