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Use map function to double each element in an array. | [1, 2, 3, 4] | function double(x) {
return x * 2;
}
let result = array.map(double); |
Use filter function to get only even numbers from an array. | [1, 2, 3, 4, 5, 6] | function isEven(x) {
return x % 2 === 0;
}
let result = array.filter(isEven); |
Use map function to square each element in an array. | [1, 2, 3, 4] | function square(x) {
return x * x;
}
let result = array.map(square); |
Use filter function to get only numbers greater than 3 from an array. | [1, 2, 3, 4, 5] | function greaterThanThree(x) {
return x > 3;
}
let result = array.filter(greaterThanThree); |
Use map function to convert each element in an array to a string. | [1, 2, 3, 4] | function toString(x) {
return x.toString();
}
let result = array.map(toString); |
Use filter function to get only numbers less than 5 from an array. | [3, 5, 8, 1, 4] | function lessThanFive(x) {
return x < 5;
}
let result = array.filter(lessThanFive); |
Use map function to add 10 to each element in an array. | [5, 10, 15] | function addTen(x) {
return x + 10;
}
let result = array.map(addTen); |
Use filter function to get only odd numbers from an array. | [2, 3, 4, 5, 6] | function isOdd(x) {
return x % 2 !== 0;
}
let result = array.filter(isOdd); |
Use map function to negate each element in an array. | [-1, 2, -3, 4] | function negate(x) {
return -x;
}
let result = array.map(negate); |
Use filter function to get only positive numbers from an array. | [-3, -2, 0, 2, 4] | function isPositive(x) {
return x > 0;
}
let result = array.filter(isPositive); |
Use map function to get the length of each string in an array. | ["apple", "banana", "cherry"] | function getLength(x) {
return x.length;
}
let result = array.map(getLength); |
Use filter function to get only strings longer than 4 characters from an array. | ["apple", "cat", "banana"] | function longerThanFour(x) {
return x.length > 4;
}
let result = array.filter(longerThanFour); |
Use map function to convert each string in an array to uppercase. | ["apple", "banana", "cherry"] | function toUpperCase(x) {
return x.toUpperCase();
}
let result = array.map(toUpperCase); |
Use filter function to get only strings containing the letter 'a' from an array. | ["apple", "dog", "banana", "cherry"] | function containsA(x) {
return x.includes('a');
}
let result = array.filter(containsA); |
Use map function to multiply each element in an array by 3. | [1, 2, 3, 4] | function multiplyByThree(x) {
return x * 3;
}
let result = array.map(multiplyByThree); |
Use filter function to get only numbers divisible by 2 from an array. | [1, 2, 3, 4, 5, 6] | function isDivisibleByTwo(x) {
return x % 2 === 0;
}
let result = array.filter(isDivisibleByTwo); |
Use map function to subtract 1 from each element in an array. | [1, 2, 3, 4] | function subtractOne(x) {
return x - 1;
}
let result = array.map(subtractOne); |
Use filter function to get only non-negative numbers from an array. | [-1, 0, 1, 2, -2] | function isNonNegative(x) {
return x >= 0;
}
let result = array.filter(isNonNegative); |
Use map function to append '!' to each string in an array. | ["hello", "world"] | function appendExclamation(x) {
return x + '!';
}
let result = array.map(appendExclamation); |
Use filter function to get only strings that start with the letter 'b' from an array. | ["apple", "banana", "cherry", "blueberry"] | function startsWithB(x) {
return x.startsWith('b');
}
let result = array.filter(startsWithB); |
Use map function to get the names of all persons in an array of person objects. | [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}] | function getName(person) {
return person.name;
}
let result = array.map(getName); |
Use filter function to get all persons older than 25 in an array of person objects. | [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}] | function isOlderThan25(person) {
return person.age > 25;
}
let result = array.filter(isOlderThan25); |
Use map function to get the names of all cars in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function getCarName(car) {
return car.make + ' ' + car.model;
}
let result = array.map(getCarName); |
Use filter function to get all cars of a specific make in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function isToyota(car) {
return car.make === 'Toyota';
}
let result = array.filter(isToyota); |
Use map function to get the names of all cities in an array of city objects. | [{"name": "New York", "population": 8000000}, {"name": "Los Angeles", "population": 4000000}] | function getCityName(city) {
return city.name;
}
let result = array.map(getCityName); |
Use filter function to get all cities with a population greater than 5 million in an array of city objects. | [{"name": "New York", "population": 8000000}, {"name": "Los Angeles", "population": 4000000}] | function isLargeCity(city) {
return city.population > 5000000;
}
let result = array.filter(isLargeCity); |
Use map function to get the ages of all persons in an array of person objects. | [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}] | function getAge(person) {
return person.age;
}
let result = array.map(getAge); |
Use filter function to get all persons younger than 30 in an array of person objects. | [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}] | function isYoungerThan30(person) {
return person.age < 30;
}
let result = array.filter(isYoungerThan30); |
Use map function to get the full names of all persons in an array of person objects with first and last names. | [{"firstName": "Alice", "lastName": "Smith"}, {"firstName": "Bob", "lastName": "Johnson"}] | function getFullName(person) {
return person.firstName + ' ' + person.lastName;
}
let result = array.map(getFullName); |
Use filter function to get all cars of a specific model in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function isCorolla(car) {
return car.model === 'Corolla';
}
let result = array.filter(isCorolla); |
Use map function to get the populations of all cities in an array of city objects. | [{"name": "New York", "population": 8000000}, {"name": "Los Angeles", "population": 4000000}] | function getPopulation(city) {
return city.population;
}
let result = array.map(getPopulation); |
Use filter function to get all cities with a name starting with 'N' in an array of city objects. | [{"name": "New York", "population": 8000000}, {"name": "Los Angeles", "population": 4000000}] | function nameStartsWithN(city) {
return city.name.startsWith('N');
}
let result = array.filter(nameStartsWithN); |
Use map function to get the initials of all persons in an array of person objects with first and last names. | [{"firstName": "Alice", "lastName": "Smith"}, {"firstName": "Bob", "lastName": "Johnson"}] | function getInitials(person) {
return person.firstName.charAt(0) + person.lastName.charAt(0);
}
let result = array.map(getInitials); |
Use filter function to get all persons with last names starting with 'S' in an array of person objects. | [{"firstName": "Alice", "lastName": "Smith"}, {"firstName": "Bob", "lastName": "Johnson"}] | function lastNameStartsWithS(person) {
return person.lastName.startsWith('S');
}
let result = array.filter(lastNameStartsWithS); |
Use map function to get the lengths of car models in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function getModelLength(car) {
return car.model.length;
}
let result = array.map(getModelLength); |
Use filter function to get all cars with a model length greater than 5 in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function modelLengthGreaterThan5(car) {
return car.model.length > 5;
}
let result = array.filter(modelLengthGreaterThan5); |
Use map function to get the uppercased names of all cities in an array of city objects. | [{"name": "New York", "population": 8000000}, {"name": "Los Angeles", "population": 4000000}] | function getUppercasedName(city) {
return city.name.toUpperCase();
}
let result = array.map(getUppercasedName); |
Use filter function to get all cities with a name containing 'o' in an array of city objects. | [{"name": "New York", "population": 8000000}, {"name": "Los Angeles", "population": 4000000}] | function nameContainsO(city) {
return city.name.includes('o');
}
let result = array.filter(nameContainsO); |
Use map function to get the lowercase names of all cars in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function getLowercasedName(car) {
return car.make.toLowerCase() + ' ' + car.model.toLowerCase();
}
let result = array.map(getLowercasedName); |
Use filter function to get all cars with a make containing 'o' in an array of car objects. | [{"make": "Toyota", "model": "Corolla"}, {"make": "Honda", "model": "Civic"}] | function makeContainsO(car) {
return car.make.includes('o');
}
let result = array.filter(makeContainsO); |