Array.filter not return exactly properties of object?

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I'm trying to understand some built in method of array. Here is my code for small function, I want to display "name" and "category" of each item, which is store in inventory with total value larger than 1000. But when I try to print bigPrice, it always display all of property of each object and I only want to display "name" and "category". Anyone can help?

var products = [
{name: 'A', quantity: 2, unitPrice: 100, category: 'Electronic goods'},
{name: 'B', quantity: 1, unitPrice: 400, category: 'Electronic goods'},
{name: 'C', quantity: 5, unitPrice: 15, category: 'Clothing goods'},
{name: 'D', quantity: 2, unitPrice: 95, category: 'Clothing goods'},
{name: 'E', quantity: 300, unitPrice: 10, category: 'Home, Garden goods'},
{name: 'F', quantity: 60, unitPrice: 150, category: 'Handmade'},
{name: 'G', quantity: 10, unitPrice: 105, category: 'Automotive goods'}
];

var bigPrice = products.filter(function(item) {
if (item.quantity * item.unitPrice > 1000) {
    return item.name + ' || ' + item.category;
}
});

bigPrice;

filter function doesn't return the custom value, you need to use map and filter together or alternatively reduce

var products = [
{name: 'A', quantity: 2, unitPrice: 100, category: 'Electronic goods'},
{name: 'B', quantity: 1, unitPrice: 400, category: 'Electronic goods'},
{name: 'C', quantity: 5, unitPrice: 15, category: 'Clothing goods'},
{name: 'D', quantity: 2, unitPrice: 95, category: 'Clothing goods'},
{name: 'E', quantity: 300, unitPrice: 10, category: 'Home, Garden goods'},
{name: 'F', quantity: 60, unitPrice: 150, category: 'Handmade'},
{name: 'G', quantity: 10, unitPrice: 105, category: 'Automotive goods'}
];

var bigPrice = products.map(function(item) {
if (item.quantity * item.unitPrice > 1000) {
    return item.name + ' || ' + item.category;
}
}).filter(item => typeof item !== 'undefined');

console.log(bigPrice)

Array.prototype.filter(), The filter() method creates a new array with all elements that pass the If no elements pass the test, an empty array will be returned. the value of the element; the index of the element; the Array object being This algorithm is exactly equivalent to the one specified in Inheritance: Function; Properties. I have the following JavaScript array of real estate home objects: What I would like to do is be able to perform a filter on the object to return a subset of "home" objects. For example, I want to be able to filter based on: price, sqft, num_of_beds, and num_of_baths. How can I perform something in JavaScript like the pseudo-code below:

Whatever you return to the function passed to filter is only tested for truthyness, nothing else. If you return a (non-empty) string, it's determined to be truthy, and is then immediately discarded. For what you're doing, you could use .filter followed by .map, but it would be better to use reduce so you only have to iterate over the array once:

var products = [
{name: 'A', quantity: 2, unitPrice: 100, category: 'Electronic goods'},
{name: 'B', quantity: 1, unitPrice: 400, category: 'Electronic goods'},
{name: 'C', quantity: 5, unitPrice: 15, category: 'Clothing goods'},
{name: 'D', quantity: 2, unitPrice: 95, category: 'Clothing goods'},
{name: 'E', quantity: 300, unitPrice: 10, category: 'Home, Garden goods'},
{name: 'F', quantity: 60, unitPrice: 150, category: 'Handmade'},
{name: 'G', quantity: 10, unitPrice: 105, category: 'Automotive goods'}
];

var bigPrice = products.reduce((a, { quantity, unitPrice, name, category }) => {
  if (quantity * unitPrice > 1000) a.push(name + ' || ' + category);
  return a;
}, []);

console.log(bigPrice);

array_filter - Manual, array_filter — Filters elements of an array using a callback function If the callback function returns TRUE , the current value from array is returned into the result json_encode() will convert your result array into an object instead of an array. me) in filtering out elements with certain key-names, array_filter won't help you. Filter an array of objects based on property, or multiple property values - ofilter.php

filter will create a new array with all the elements that return a truthy value from the function. You could use filter and then map:

var bigPrice = products.filter(function(item) {
  return item.quantity * item.unitPrice > 1000;
}).map(function(item) {
  return item.name + ' || ' + item.category;
});

JavaScript Array Filter: Filtering Array Elements Based on a Test , This tutorial shows you how to use the JavaScript array filter method to filter have an array of city objects where each object contains two properties: name and If the callback function returns true , it includes the element in the return array. It is important to note that the filter() method does not change the original array. Introduction to JavaScript array filter() method. One of the most common tasks when working with an array is to create a new array that contains a subset of elements of the original array. Suppose you have an array of city objects where each object contains two properties: name and population.

Use Array#reduce for it because you need to filter and map at the same time:

var products = [{
    name: 'A',
    quantity: 2,
    unitPrice: 100,
    category: 'Electronic goods'
  },
  {
    name: 'B',
    quantity: 1,
    unitPrice: 400,
    category: 'Electronic goods'
  },
  {
    name: 'C',
    quantity: 5,
    unitPrice: 15,
    category: 'Clothing goods'
  },
  {
    name: 'D',
    quantity: 2,
    unitPrice: 95,
    category: 'Clothing goods'
  },
  {
    name: 'E',
    quantity: 300,
    unitPrice: 10,
    category: 'Home, Garden goods'
  },
  {
    name: 'F',
    quantity: 60,
    unitPrice: 150,
    category: 'Handmade'
  },
  {
    name: 'G',
    quantity: 10,
    unitPrice: 105,
    category: 'Automotive goods'
  }
];

var bigPrice = products.reduce(function(res, item) {
  if (item.quantity * item.unitPrice > 1000) {
    res.push(item.name + ' || ' + item.category);
  }
  
  return res;
}, []);

console.log(bigPrice);

Learn & Understand JavaScript's Filter Function, The filter() method returns a new array created from all elements that pass a certain test preformed on an original Returning true keeps the element, returning false to not keep it. Lets consider a more complex example that utilizes an array of objects. The below code is exactly equal to the above code: If there's an object whose admins->member value is equal to 11, remove the object and return the array without this object. The returned array would thus be : The returned array would thus be :

You can use map method and destructing by applying a provided callback function for every item from your given array.

var products = [
{name: 'A', quantity: 2, unitPrice: 100, category: 'Electronic goods'},
{name: 'B', quantity: 1, unitPrice: 400, category: 'Electronic goods'},
{name: 'C', quantity: 5, unitPrice: 15, category: 'Clothing goods'},
{name: 'D', quantity: 2, unitPrice: 95, category: 'Clothing goods'},
{name: 'E', quantity: 300, unitPrice: 10, category: 'Home, Garden goods'},
{name: 'F', quantity: 60, unitPrice: 150, category: 'Handmade'},
{name: 'G', quantity: 10, unitPrice: 105, category: 'Automotive goods'}
];

var bigPrice = products.filter((item)=> item.quantity * item.unitPrice > 1000)
                       .map(({name,category})=>(name + '||' + category));

console.log(bigPrice);

jQuery.grep(), Description: Finds the elements of an array which satisfy a filter function. The function should return a Boolean value. this will be the global window object. If "invert" is false, or not provided, then the function returns an array consisting of all Properties of jQuery Object Instances · Properties of the Global jQuery Object. filter() does not mutate the array on which it is called. The range of elements processed by filter() is set before the first invocation of callback. Elements which are appended to the array after the call to filter() begins will not be visited by callback. If existing elements of the array are changed, or deleted,

Array methods, The arrays are objects, so we can try to use delete : isConcatSpreadable property, then it's treated as an array by concat : its elements are added instead: So, if we look for false , it finds exactly false and not the zero. The syntax is similar to find , but filter returns an array of all matching elements:. After looking at the example more closely I realize that observable.filter might not be what you want but you can still at the very least use observable.map and then inside the mapping function use array.filter. Just depends on the shape of the data and how you are piping it. But either way this can just be done as part of the observable stream.

Where-Object, Where-Object returns all objects for which the script block statement is true. Where-Object [-InputObject <PSObject>] [-Property] <String> -Not [<​CommonParameters>] Specifies the script block that is used to filter the objects​. If the property value of an object is an array, PowerShell uses reference equality to determine  Array.filter returns a new array, though. I'd rather change a visible: true/false boolean in each of the objects, so I can order them with a CSS flexbox setup :). That said, I could technically work with 2 arrays: one with the active objects, and one with the inactive objects, and join them later but that feels like hell to maintain.

How to Use Map, Filter, & Reduce in JavaScript, Each task is an object, each with a name and duration property: You don't have to create a new array and push into it. map returns the It does exactly what it sounds like: It takes an array, and filters out unwanted elements. var newArray = array.filter(function(item) { return condition; }); The item argument is a reference to the current element in the array as filter() checks it against the condition. This is useful for accessing properties, in the case of objects. If the current item passes the condition, it gets sent to the new array. Filtering an array of objects

Comments
  • Filter returns an array of the objects that match the criteria (i.e. the callback returns truth-y), not the result of the callback. See e.g. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/….
  • Array.filter() expects that you return either true or false, depending on if the element has to stay or not. WHat you're trying to do here is either Array.foEach() or Array.map().
  • Thanks for explaining. I got it.
  • I also was downvoted but i wrote a correct answer. Thus, +1 for your correct answer also.