Filtering objects from array lodash

Question

I have an Array like this

var data = [
 {attribute_code: "description", value: "<p>Description</p>"}, 
 {attribute_code: "category_ids", value: Array(2)},
 {attribute_code: "required_options", value: "0"},
 {attribute_code: "has_options", value: "0"},
 {attribute_code: "activity", value: "11,18,19,20,21,22,23"},
 {attribute_code: "material", value: "37,38"}
]

Using lodash i would like to remove description, category_ids, required_options, has_options from it to look like

[
 {attribute_code: "activity", value: "11,18,19,20,21,22,23"},
 {attribute_code: "material", value: "37,38"}
]

I tried something like this

const filter = _(customAttributes)
    .keyBy('attribute_code')
    .pullAt(['description', 'category_ids', 'required_options', 'has_options'])
    .value();

But this is returning

[
 {attribute_code: "description", value: "<p>Description</p>"}, 
 {attribute_code: "category_ids", value: Array(2)},
 {attribute_code: "required_options", value: "0"},
 {attribute_code: "has_options", value: "0"},
]

as _.at, i guess its not mutating the array. What am i doing wrong here? I just cant figure it out.

ntalbs · Accepted Answer · 2018-02-21 12:53:27Z

1

Assuming that your original array is stored in data,

var data = [
 {attribute_code: "description", value: "<p>Description</p>"}, 
 {attribute_code: "category_ids", value: Array(2)},
 {attribute_code: "required_options", value: "0"},
 {attribute_code: "has_options", value: "0"},
 {attribute_code: "activity", value: "11,18,19,20,21,22,23"},
 {attribute_code: "material", value: "37,38"}
]

You can filter out unwanted elements with filter function:

var toRemove = new Set([
     "description",
     "category_ids",
     "required_options",
     "has_options"
])

_(data).filter(e => !toRemove.has(e.attribute_code)).value()

Also, this can be done without lodash.

data.filter(e => !toRemove.has(e.attribute_code))

edited Feb 21, 2018 at 12:53

answered Feb 21, 2018 at 8:37

ntalbs

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1 Comment

MePo Over a year ago

That works. I get confused with all the methods and don't know which one to use at the end ty.

Hassan Imam · Accepted Answer · 2018-02-21 08:41:30Z

You can use dropWhile()

var data = [{attribute_code: "description", value: "<p>Description</p>"},{attribute_code: "category_ids", value: Array(2)},{attribute_code: "required_options", value: "0"},{attribute_code: "has_options", value: "0"},{attribute_code: "activity", value: "11,18,19,20,21,22,23"},{attribute_code: "material", value: "37,38"}],
    removeParameters = ['description', 'category_ids', 'required_options', 'has_options'],
    result = _.dropWhile(data, ({attribute_code}) => removeParameters.includes(attribute_code));
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.js"></script>

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