JAVASCRIPT

filter javascript

const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length < 6);

console.log(result);

//OUTPUT: ['spray', 'limit', 'elite']

filter in array function

const persons = [
  {name:"Shirshak",gender:"male"},
  {name:"Amelia",gender:"female"},
  {name:"Amand",gender:"male"}
]
//filter return all objects in array
let male = persons.filter(function(person){
return person.gender==='male'
})
console.log(male) //[{name:"Shirshak",gender:"male"},{name:"Amand",gender:"male"}]

//find return first object that match condition
let female = persons.find(function(person){
return person.gender==='female'
})

how the filter() function works javascript

const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

const filter = arr.filter((number) => number > 5);
console.log(filter); // [6, 7, 8, 9]

javascript filter

const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const threeLetterWords = words.filter(word => word.length <= 5)

console.log(threeLetterWords);

// RESULT: (3) ["spray", "limit", "elite"]

javascript array filter

var numbers = [1, 3, 6, 8, 11];

var lucky = numbers.filter(function(number) {
  return number > 7;
});

// [ 8, 11 ]

How does filter works in javascript?

const products = [
    { name: 'Laptop', price: 32000, brand: 'Lenovo', color: 'Silver' },
    { name: 'Phone', price: 700, brand: 'Iphone', color: 'Golden' },
    { name: 'Watch', price: 3000, brand: 'Casio', color: 'Yellow' },
    { name: 'Aunglass', price: 300, brand: 'Ribon', color: 'Blue' },
    { name: 'Camera', price: 9000, brand: 'Lenovo', color: 'Gray' },
];
//Get products that price is greater than 3000 by using a filter
const getProduct = products.filter(product => product.price > 3000);
console.log(getProduct)
//Expected output:
/*[
    { name: 'Laptop', price: 32000, brand: 'Lenovo', color: 'Silver' },
    { name: 'Camera', price: 9000, brand: 'Lenovo', color: 'Gray' }
  ]
*/

filter in js

const filterThisArray = ["a","b","c","d","e"] 
console.log(filterThisArray) // Array(5) [ "a","b","c","d","e" ]

const filteredThatArray = filterThisArray.filter((item) => item!=="e")
console.log(filteredThatArray) // Array(4) [ "a","b","c","d" ]

how to filter array in javascript

let names = ['obi','bisi','ada','ego']

const res = names.filter(name => name.length > 3)

javascript filter

const filtered = array.filter(item => {
    return item < 20;
});
// An example that will loop through an array
// and create a new array containing only items that
// are less than 20. If array is [13, 65, 101, 19],
// the returned array in filtered will be [13, 19]

array filter

const selected = [
    {
        "id": "d89a16e9-12cf-4365-9709-b92f22c03b47",
        "selected": true
    },
    {
        "id": "def36273-0ffa-439b-bbbb-5ffa6afb65a4",
        "selected": false
    },
    {
        "id": "e783f7a0-88f3-4224-94fc-f778c405d787",
        "selected": true
    }
]

selected.filter((item) => item.selected)
console.log(selected)
// Result
[
    {
        "id": "d89a16e9-12cf-4365-9709-b92f22c03b47",
        "selected": true
    },
    {
        "id": "e783f7a0-88f3-4224-94fc-f778c405d787",
        "selected": true
    }
]

filter array

const filteredArray = array.filter(element => element.id != id))

JavaScript Array Methods .filter()

const colours = ['green', 'black', 'dark-orange', 'light-yellow', 'azure'];
// a 6 karakternél hosszab színekre szűrünk:
const result = colours.filter(colour => colour.length > 6);
console.log(result);
// --> [ 'dark-orange', 'light-yellow' ]

js array .filter

// The filter() method creates a new array with all elements 
// that pass the test implemented

const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length > 6);

console.log(result);
// expected output: Array ["exuberant", "destruction", "present"]

filter in javascript

const arr = [1, 2, 3, 4, 5, 6];
const filtered = arr.filter(el => el === 2 || el === 4);	//[2, 4]

js filter

return arr.filter(item => item !=null)

array filter

const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length > 5)

console.log(result);
// expected output: Array ["exuberant", "destruction", "present"]

array filter

filter method javascript

let Arr = [1,2,2,2,3,4,4,5,6,6];

//way1
let unique = [...new Set(Arr)];
console.log(unique);

//way2
function removeDuplicate (arr){
	return arr.filter((item,index)=> arr.indexOf(item) === index);
}

removeDuplicate(Arr);

filter in javascipt

const numbers = [5, 13, 7, 30, 5, 2, 19];
const bigNumbers = numbers.filter(number => number > 20);
console.log(bigNumbers);
//Output: [30]

array.filter

// filter(): returns a new array with all elements that pass the test
// If no elements pass the test, an empty array will be returned.

const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length > 6);

console.log(result);
// expected output: Array ["exuberant", "destruction", "present"]

js filter method

const randomNumbers = [4, 11, 42, 14, 39];
const filteredArray = randomNumbers.filter(n => {  
  return n > 5;
});

filtering in javascript

  //filter numbers divisible by 2 or any other digit using modulo operator; %
  
  const figures = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  const divisibleByTwo = figures.filter((num) => {
    return num % 2 === 0;
  });
  console.log(divisibleByTwo);

javascript filter

const myNum = [2,3,4,5,6,7,8,9,10];
//using filter gives us a new array
const divisibleBy3 = myNum.filter(eachNum => eachNum%3==0); 
console.log(divisibleBy3); //output:[3,6,9]

filter array js

const arr = ['pine', 'apple', 'pineapple', 'ball', 'roll'];
const longWords = arr.filter(item => item.length > 5);

console.log(longWords);   // ['pineapple']

array.filter in javascript

//How To Use Array.filter() in JavaScript
//example 1. 
const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length < 6);

console.log(result);

//OUTPUT: ['spray', 'limit', 'elite'

//example 2
const numbers = [45, 4, 9, 16, 25];
const over18 = numbers.filter(myFunction);

function myFunction(value, index, array) {
  return value > 18;
}

filter array

const oddFiltration = (arr) => {
    const result = arr.filter(n => n%2);

    
      return (result);
}

//if you find this answer is useful ,
//upvote ⇑⇑ , so can the others benefit also . @mohammad alshraideh ( ͡~ ͜ʖ ͡°)

JavaScript filter method

const grades = [10, 2, 21, 35, 50, -10, 0, 1];

// get all grades > 20
const result = grades.filter(grade => grade > 20); // [21, 35, 50];

// get all grades > 30
grades.filter(grade => grade > 30); // [35, 50]

the filter array

var id = 2;
var list = [{
  Id: 1,
  Name: 'a'
}, {
  Id: 2,
  Name: 'b'
}, {
  Id: 3,
  Name: 'c'
}];
var lists = list.filter(x => {
  return x.Id != id;
})
console.log(lists);

filter javascript

let arr = [1,2,3,0,4,5]
let arr2=[0,2]

let ans = arr.filter(function(value,index,array){

return !this.includes(value) 
},arr2)

  console.log(ans)

JavaScript Array filter()

const numbers = [45, 4, 9, 16, 25];
const over18 = numbers.filter(myFunction);

function myFunction(value, index, array) {
  return value > 18;
}

filter array with an array

/* Here's an example that uses (some) ES6 Javascript semantics to filter an object array by another object array. */

        // x = full dataset
        // y = filter dataset
        let x = [
            {"val": 1, "text": "a"},
            {"val": 2, "text": "b"},
            {"val": 3, "text": "c"},
            {"val": 4, "text": "d"},
            {"val": 5, "text": "e"}
            ],
            y = [
            {"val": 1, "text": "a"},
            {"val": 4, "text": "d"}               
            ];

        // Use map to get a simple array of "val" values. Ex: [1,4]
        let yFilter = y.map(itemY => { return itemY.val; });

        // Use filter and "not" includes to filter the full dataset by the filter dataset's val.
        let filteredX = x.filter(itemX => !yFilter.includes(itemX.val));

        // Print the result.
        console.log(filteredX);
 Run code snippet

javascript filter method

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Using Javascript Filter Method</title>
</head>
<body>
    <h1 id="demo"></h1>

    <!-- <script src="index.js"></script> -->

    <script>
        const person = [ 
    {name:"fredrick",
        "id":1,
    },

    {name:"sarah",
        "id":2
    },
    {name:"favour",
        "id":3
    },
    {name:"abraham",
        "id":4
    },
    {name:"isaac",
        "id":5
    },

    {name:"esther",
        "id":6
    }
]

let sortedPerson = person
sortedPerson = sortedPerson.filter(item => {
if (item.name === "fredrick" ){
    return true

    }

})
    console.log(sortedPerson)

  
    </script>
</body>
</html>

javascript filter array

let bigCities = cities.filter(city => city.population > 3000000);
console.log(bigCities);Code language: JavaScript (javascript)

array.filter

// let arr = [1,2,3]

/*
  filter accepts a callback function, and each value of arr is passed to the 
  callback function. You define the callback function as you would a regular
  function, you're just doing it inside the filter function. filter applies the code 
  in the callback function to each value of arr, and creates a new array based on your 
  callback functions return values. The return value must be a boolean, which denotes whether an element 
  should be keep or not
*/
let filteredArr = arr.filter(function(value){
	return value >= 2
})

// filteredArr is:
// [2,3]

JavaScript filter

/*
  Filter
  - Filter Longest Word By Number
*/

// Filter Words More Than 4 Characters
let sentence = "I Love Foood Code Too Playing Much";

let smallWords = sentence
  .split(" ")
  .filter(function (ele) {
    return ele.length <= 4;
  })
  .join(" ");

console.log(smallWords);

// Ignore Numbers
let ignoreNumbers = "Elz123er4o";

let ign = ignoreNumbers
  .split("")
  .filter(function (ele) {
    return isNaN(parseInt(ele));
  })
  .join("");

console.log(ign);

// Filter Strings + Multiply
let mix = "A13BS2ZX";

let mixedContent = mix
  .split("")
  .filter(function (ele) {
    return !isNaN(parseInt(ele));
  })
  .map(function (ele) {
    return ele * ele;
  })
  .join("");

console.log(mixedContent);

filter in js

let numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// function to check even numbers
function checkEven(number) {
  if (number % 2 == 0)
    return true;
  else
    return false;
}

// create a new array by filter even numbers from the numbers array
let evenNumbers = numbers.filter(checkEven);
console.log(evenNumbers);

// Output: [ 2, 4, 6, 8, 10 ]

filter function

# filter function
l1=[10,20,30,40,50,60,70,80]
l2= [i for i in filter(lambda x:x>30,l1)]
print(l2)


# [40, 50, 60, 70, 80]
# filter takes a function and a collection. It returns a collection of every item for which the function returned True.

filter function in javascript

filter function in javascript-Es6--Filter

javascript filter

const randomNumbers = [4, 11, 42, 14, 39];
const filteredArray = randomNumbers.filter(n => {  
  return n > 5;
});

filter method

function filter(array, test) {
  let passed = [];
  for (let element of array) {
    if (test(element)) {
      passed.push(element);
    }
  }
  return passed;
}

console.log(filter(SCRIPTS, script => script.living));
// → [{name: "Adlam", …}, …]

js filter example

element.style.filter = "brightness(300%)";

array.filter

var newArray = array.filter(function(item)
 {
  return conditional_statement;
 });

filter array elements

int[] a = {1,2,3,4};
boolean contains = IntStream.of(a).anyMatch(x -> x == 4);

javascript filter method

var jsonarr = [
    {
        id: 1,
        name: "joe"
    },
    {
        id: -19,
        name: "john"
    },
    {
        id: 20,
        name: "james"
    },
    {
        id: 25,
        name: "jack"
    },
    {
        id: -10,
        name: "joseph"
    },
    {
        id: "not a number",
        name: "jimmy"
    },
    {
        id: null,
        name: "jeff"
    },
]
 
var result = jsonarr.filter(user => user.id > 0);
 
console.log(result);

how to create my own filter in js

// filter takes an array and function as argumentfunction 
filter(arr, filterFunc) {
  const filterArr = []; // empty array        
  // loop though array    
  for(let i=0;i<arr.length;i++) {        
    const result = filterFunc(arr[i], i, arr);        
    // push the current element if result is true        
    if(result)             
      filterArr.push(arr[i]);     
  }    
  return filterArr;
}

What is the filter() method? in Javascript

/* What is the filter() method?
	This method returns all the elements of the array that satisfy the condition
    specified in the callback function.
*/

const x = [1, 2, 3, 4, 5];

const y = x.filter(el => el*2 === 2);

console.log("y is: ", y); // y is: [1]

/* If you check out the output of the above example,
	the value of y is an array of 1 element that satisfies the condition.
    This is because the filter() method iterates over all elements of the array and
    then returns a filtered array which satisfy the condition specified.
*/