JavaScript Interview Questions & Answers

Q) What are JavaScript Data Types?

Following are the JavaScript Data types:

• Number
• String
• Boolean
• Object
• Undefined

Q) Some ES6 Features

• Default Parameters

# Before ES6
function multiply(x){
   var a = x||1;
   return a;
}
# After ES6
function multiply(x=1){
   return x;
}

• Template Literals

#  Before ES6:
var greeting = "Hello " + name + " Welcome Back!";
# After ES6:
var greeting = "Hellow ${name} welcome back !";

• Multi-line Strings

#  Before ES6:
var multiline = "This string sort of\n"
+ "like a multi-line string."
# After ES6:
var multiline = `This string sort of,
like a multi-line string.`

VueJs

Q) How to bind classes with html in vuejs?

<div v-bind:class="{ active: isActive}" ></div>
<div v-bind:class="{ isActive ? active : ''}" ></div>
data: {   
   isActive: true
}