Can LoDash's _.filter be utilized in a scenario where you want to retrieve values based on the presence of a specific string within the keys? For instance, consider the following data:
Mydata{
"banana" : "1"
}
If I aim to extract values containing "ana", how can this be achieved using LoDash? While most resources focus on searching element values, I am interested in filtering based on keys.
If you are looking to retrieve an array of values where the keys meet a specific condition, Lodash's _.filter() can be used with objects as well. The second parameter passed to the callback function is the key.
var data = {
"banana": 1,
'lorem': 2,
'123ana': 3
}
var result = _.filter(data, function(v, k) {
return _.includes(k, 'ana');
});
console.log(result);<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>If you need an object where the properties adhere to a specific criterion, you can opt for _.pickBy() in a similar manner.
var data = {
"banana": 1,
'lorem': 2,
'123ana': 3
}
var result = _.pickBy(data, function(v, k) {
return _.includes(k, 'ana');
});
console.log(result);<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>To achieve the desired outcome, you can utilize the built-in Array#reduce method to filter and return an object with keys that contain a specific string.
const data = {
apple: 'red',
banana: 'yellow',
strawberry: 'red',
peach: 'orange',
}
const filterByKey = (dataObject, keyword) => {
return Object.keys(dataObject).reduce((result, key) => {
if (key.includes(keyword)) {
result[key] = dataObject[key];
}
return result;
}, {});
}
console.log(filterByKey(data, 'app'));To retrieve keys containing a specific substring, you can start by utilizing the filter() method, followed by using the map() method to extract values.
var data = {
"banana": 1,
'lorem': 2,
'123ana': 3
}
var result = _.chain(data)
.keys()
.filter(e => _.includes(e, 'ana'))
.map(e => data[e])
.value()
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