Example 1: js filter array of objects by value
var heroes = [
{name: “Batman”, franchise: “DC”},
{name: “Ironman”, franchise: “Marvel”},
{name: “Thor”, franchise: “Marvel”},
{name: “Superman”, franchise: “DC”}
];
var marvelHeroes = heroes.filter(function(hero) {
return hero.franchise == “Marvel”;
});
// [ {name: “Ironman”, franchise: “Marvel”}, {name: “Thor”, franchise: “Marvel”} ]
Example 2: filtering json array in javascript
const data = [
{
name: 'Bob',
gender: 'male',
age: 34,
},
{
name: 'Carol',
gender: 'female',
age: 36,
},
{
name: 'Ted',
gender: 'male',
age: 38,
},
{
name: 'Alice',
gender: 'female',
age: 40,
},
];
const arr1 = data.filter(d => d.age > 37);
console.log('arr1', arr1);
const arr2 = data.filter(d => d.gender === 'female');
console.log('arr2', arr2);
const ageAndGender = d => d.age > 37 && d.gender === 'female';
const arr3 = data.filter(ageAndGender);
console.log('arr3', arr3);
Example 3: js filter object
/** filter object by key or value */
/** filter object function */
function filterObj( obj, predicate ) {
var result = {}, key;
for ( key in obj ) {
if ( obj.hasOwnProperty( key ) && predicate( key, obj[ key ] ) ) {
result[ key ] = obj[ key ];
}
}
return result;
};
// example
// set object
var obj = {
name : 'john',
lastName : 'smith',
age : 32
}
// filter out parameters using key and value
var filteredObj = filterObj( obj, function( key, value ) {
return key !== 'age' && value !== 'smith'
});
// show result
console.log( filteredObj ); // { name: "john" }
Example 4: array filter
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"]
Example 5: js filter items by index
let newArray = arr.filter(callback(element[, index, [array]])[, thisArg])