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javascript: filter objects by multiple values with array using a functional approach


By : newcomer
Date : July 29 2020, 10:00 AM
help you fix your problem Creating an array of the key names is the right idea - check if .some of them, when that property is accessed on the object, are equal to the value:
code :
const filter_by_multiple_Columns = (carObject, value) => carObject.filter(
  car => list_of_keys.some(
    key => car[key] === value
  )
);
const filterByColorsObject = list_of_objects => list_of_values.map(
  value => filter_by_multiple_Columns(list_of_objects, value)
);
{ make: 'mercedez',model: 'helicopter', colors: ['', '', 'orange'] }
{ make: 'mercedez',model: 'helicopter',colors: ['orange'] }
const filter_by_multiple_Columns = (carObject, Value) => carObject.filter(
  car => car.colors.includes(Value)
);


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Functional approach to joining an Array of values with varying separator?


By : user70987
Date : March 29 2020, 07:55 AM
hope this fix your issue I'm looking for a functional way to perform this messy procedural logic: , If I understand correctly what you want, this should work:
code :
output = values.map do |v|
  ["/" + v.name.to_s, v.special? ? "/x" : ""]
end.flatten[0...-1].join
output = "/" + values.flat_map do |v|
  [v.name.to_s, ("x" if v.special?)]
end.take(2*values.size - 1).join("/")
output = ([nil] + values).each_cons(2).map do |last_value, v|
  if last_value && last_value.special?
    "/x/" + v.name.to_s
  else
    "/" + v.name.to_s
  end
end.join

Filter with multiple predicates, elegant functional approach


By : Romainhm
Date : March 29 2020, 07:55 AM
I wish this helpful for you I think you're looking for the R.allPass function. You'd simply do
code :
var selectedPredicates = …;
R.filter(R.allPass(selectedPredicates))(list)

How to filter an array of objects by the element inside an inner array - Functional Programming Javascript


By : You_Cef
Date : March 29 2020, 07:55 AM
seems to work fine You were almost there. With the check of the index with Array#indexOf, you could use it as return value.
code :
return bike.features.indexOf('carbon frame') + 1;
var bikes = [{ name: 'Cinelli Bolt', price: '2000', age: 1, singlespeed: 'yes', features: ['tubeless tires', 'disk brakes', 'carbon frame'] }, { name: 'Cinelli Mash', price: '1700', age: 3, singlespeed: 'yes', features: ['gatorskin tyres', 'sram drivetrain', 'steel frame'] }, { name: 'Specialized Langster', price: '1000', age: 1, singlespeed: 'no', features: ['two speed enclosed hub', 'bullbars', 'carbon frame'] }],
    justCarbonBikes = bikes.filter(function(bike) {
        return bike.features.indexOf('carbon frame') + 1;
    }),
    bikesWithoutCarbon = bikes.filter(function(bike) {
        return bike.features.indexOf('carbon frame') === -1;
    });

console.log(justCarbonBikes);
console.log(bikesWithoutCarbon);
.as-console-wrapper { max-height: 100% !important; top: 0; }
var bikes = [{ name: 'Cinelli Bolt', price: '2000', age: 1, singlespeed: 'yes', features: ['tubeless tires', 'disk brakes', 'carbon frame'] }, { name: 'Cinelli Mash', price: '1700', age: 3, singlespeed: 'yes', features: ['gatorskin tyres', 'sram drivetrain', 'steel frame'] }, { name: 'Specialized Langster', price: '1000', age: 1, singlespeed: 'no', features: ['two speed enclosed hub', 'bullbars', 'carbon frame'] }],
    justCarbonBikes = bikes.filter(b => b.features.includes('carbon frame')),
    bikesWithoutCarbon = bikes.filter(b => !b.features.includes('carbon frame'));

console.log(justCarbonBikes);
console.log(bikesWithoutCarbon);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Functional approach to transform an array of objects into a hierarchical structure with aggregates


By : Yusuke Ooi
Date : March 29 2020, 07:55 AM
like below fixes the issue It might not be what SO is for (as per comments above), but in case anyone needs to transform an array of flat objects into a hierarchical structure that you can simply specify the nesting order, number of levels, and field names, here is a recursive function to do so - https://github.com/lance-p/configurable-transform-flat-array-to-nested. Hope it might be of help to others.

Javascript: Filter an array of objects on multiple values


By : Mikkel Elmholdt
Date : March 29 2020, 07:55 AM
hope this fix your issue filterKeys (defined by Object.keys(filterList)) is an array of numeric keys (["0", "1", "2", "3"]) since filterList is an array whose keys are numeric indices.
I think you want filterKeys to be the keys of each object in the filterList array. This could be achieved most easily by making filterList a single object, with many keys, instead of an array of objects with one key each:
code :
const filterList = {
    'open': this.onlyOpen,
    'assmtComplete': this.onlyAssmtCompleted,
    'bureau': this.selectedBureau ? this.selectedBureau : '',
    'unit': this.selectedUnit ? this.selectedUnit : ''
];
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