what is the use of a constructor method in javascript

Blessing Obajinmi answered on May 11, 2022 Popularity 10/10 Helpfulness 3/10

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what is the use of a constructor method in javascript

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/* A constructor in Javascript is used to create a new object and set values
for any existing object properties*/

class Animal{
  
  constructor (name, height, weight){
    console.log("created animal named", name)
  }
  nameLength() {
    return name.length;
    
  }
  
}
 var dog = new Animal("Fido", 25, 90);
 var fish = new Animal("Goldie", 2, .02);

	console.log(dog.nameLength);

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: constructor javascript

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Contributed on Sep 06 2022

Blessing Obajinmi

0 Answers Avg Quality 2/10

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what is the use of a constructor function in javascript

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// The function constructor can take in multiple statements separated by a semicolon. Function expressions require a return statement with the function's name

// Observe that new Function is called. This is so we can call the function we created directly afterwards
const sumOfArray = new Function('const sumArray = (arr) => arr.reduce((previousValue, currentValue) => previousValue + currentValue); return sumArray')();

// call the function
sumOfArray([1, 2, 3, 4]);
// 10

// If you don't call new Function at the point of creation, you can use the Function.call() method to call it
const findLargestNumber = new Function('function findLargestNumber (arr) { return Math.max(...arr) }; return findLargestNumber');

// call the function
findLargestNumber.call({}).call({}, [2, 4, 1, 8, 5]);
// 8

// Function declarations do not require a return statement
const sayHello = new Function('return function (name) { return `Hello, ${name}` }')();

// call the function
sayHello('world');
// Hello, world

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Source: developer.mozilla.org

Tags: constructor cons

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Contributed on Mar 06 2023

DaddyGuigz

0 Answers Avg Quality 2/10

What is constructor.constructor()() in JavaScript

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const o = {};
o.constructor === Object;

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 11 2022

SAMER SAEID

0 Answers Avg Quality 2/10

what is the use of a constructor method in javascript

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what is the use of a constructor function in javascript

What is constructor.constructor()() in JavaScript

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