Top 100+ Ecmascript 6 Interview Questions And Answers
Question 1. What Is Es6?
Question 2. List Some New Features Of Es6?
New Features in ES6:
Support for constants (additionally called “immutable variables”)
Block-Scope assist for each variables, constants, capabilities
Extended Parameter Handling
Enhanced Regular Expression
Enhanced Object Properties
Modules, Classes, Iterators, Generators
Support for Map/Set & Weak Map/Weak Set
Promises, Meta-Programming, Internationalization & Localization.
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Question 3. What Is Babel?
For example look the underneath code snippet.
In ES6 (ECMASCRIPT 2015)
const PI = three.141593;
PI > 3.0;
In ES5 after conversion
Object.DefineProperty (exports, "__esModule",
var PI = three.141593;
PI > 3.0;
exports. I = PI;
Question 4. List Steps To Install Babel?
In order to put in Babel, you require node.Js and NPM. Make certain Node.Js is installed for your server.
To take a look at node hooked up or now not run under instructions for your terminal.
We can set up Babel CLI regionally by using running under command on terminal.
Npm installation --save-dev babel-cli
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Question five. What Is Webpack?
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Question 6. List Benefits Of Using Webpack?
Benefits of the use of Webpack:
It bundles your more than one modules and packs it right into a unmarried .Js file.
Question 7. Explain Constants In Es6?
Constants are also known as immutable variables are a unique form of variables whose content isn't changed. In Es6 a steady is described the use of const keyword. Constants in Es6 allow protection to overwrite a variable cost, enhance overall performance and helps programmers to put in writing readable and cleaner code.
const WEBSITE_URL = "http://www.Abc.Com";
WEBSITE_URL="new url"; // generate an blunders;
In earlier version of Es6
// and most effective in worldwide context and not in a block scope
Object.DefineProperty(form of global === "item" ? Global : window, "WEBSITE_URL",
value: "http://www.Abc.Com", enumerable: proper,
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Question eight. What Are Template Literals In Es6?
Template literals are the string with embedded code and variables inside. Template literal permits concatenation and interpolation in a great deal more comprehensive and clear in assessment with earlier versions of Ecma script.
var c = a+ " " + b;
Console.Log(c); //outputs Hello John;
In ES6 concatenation and interpolation is accomplished by using lower back tick “ in a single line. To interpolate a variable virtually installed to braces forwarded via $ sign.>/p>
// In ES6
permit c=`$a $b`;
console.Log(c); //outputs Hello John;
Question 9. What Is Spread Operator In Es6?
Spread Operator offers a brand new manner to control array and gadgets in Es6.A Spread operator is represented by using … observed through the variable name.
allow a =[7,8,9];
console.Log(b); // [1,2,3,7,8,9,10]
So spread operator spreads the contents of variable a and concatenates it in b.
Question 10. Explain Destructuring Assignment In Es6?
Destructing undertaking in some other improvement in Es6. It allows us to extract records from array and gadgets into separate variables.
permit complete name =['John','Deo'];
let [first_name,last_name]=complete name;
// outputs John Deo
// outputs 100 [200, 330, 400]
this.Name = call;
this. Age = age;
console.Log(this.Call + " is " + this. Age + " years antique !");
var consumer = new User("foo", 7);
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