5 Essential JavaScript Functions Every Developer Should Know

 5 Essential JavaScript Functions Every Developer Should Know

JavaScript provides a variety of functions that can be used to manipulate data and create complex applications. In this post, we'll cover five essential JavaScript functions that every developer should know.

Array.prototype.forEach()

The forEach() method is used to execute a provided function once for each array element. Here's an example:

javascript

const array = [1, 2, 3];

array.forEach((element) => {

  console.log(element);

});

// Output: 

// 1

// 2

// 3

Object.assign()

The Object.assign() method is used to copy the values of all enumerable properties from one or more source objects to a target object. Here's an example:

css

const target = { a: 1, b: 2 };

const source = { b: 4, c: 5 };

const result = Object.assign(target, source);

console.log(result);

// Output: { a: 1, b: 4, c: 5 }

Array.prototype.map()

The map() method creates a new array with the results of calling a provided function on every element in the calling array. Here's an example:

const array = [1, 2, 3];

const mappedArray = array.map((element) => {

  return element * 2;

});

console.log(mappedArray);

// Output: [2, 4, 6]

Array.prototype.filter()

The filter() method creates a new array with all elements that pass the test implemented by the provided function. Here's an example:

javascript

const array = [1, 2, 3, 4];

const filteredArray = array.filter((element) => {

  return element % 2 === 0;

});

console.log(filteredArray);

// Output: [2, 4]

Conditional (ternary) operator

The conditional operator (also known as the ternary operator) is a shorthand way of writing an if...else statement. Here's an example:

javascript

const age = 

const isAdult = (age >= 18) ? 'Yes' : 'No';

console.log(isAdult);

// Output: 'Yes' or 'No'

These five essential JavaScript functions can help make your code more efficient and effective. Whether you're working with arrays, objects, or conditionals, having a strong understanding of these functions will make you a better JavaScript developer.