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String.join() Example – Java 8

Java 8 has String.join() method where first parameter is separator and then you can pass either multiple strings or some instance of Iterable having instances of strings as second parameter. Here is the sample program: Advertisements

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Posted in JAVA, JAVA8, Others

Node JS experienced interview questions

Is Node.js Single-threaded? Why it is required? Yes, Node Js is single threaded to perform asynchronous processing. All Node JS applications uses “Single Threaded Event Loop Model” architecture to handle multiple concurrent clients. Doing async processing on a single thread

Posted in Nodejs, Others

How to convert a JKS Keystore to a PKCS12 (.p12) format

To convert a JKS (.jks) keystore to a PKCS12 (.p12) keystore, run the following command: Note: This command is supported on JDK / JRE keytool versions 1.6 and greater. keytool -importkeystore -srckeystore <jks_file_name.jks> -destkeystore <pk12_file_name.p12> -srcstoretype JKS -deststoretype PKCS12 -deststorepass

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Posted in JAVA

What is a WeakMap in ES6?

A WeakMap is just like a normal Map with a few key differences: a WeakMap can only contain objects as keys, a WeakMap is not iterable which means it can’t be looped and a WeakMap does not have a .clear()

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Posted in ES6, JavaScript

ES6 Default Function Parameters

Unlike the defining the default values in JavaScript, ES6 has provided a flexibility to define the default values during the function definition time.  In regular Javascript, we define a variable with one value, override that value with in the function

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Posted in ES6, JavaScript, Struts

Arrow Functions in ES6

ES6 introduces a new kind of function called arrow function. Arrow functions are very similar to regular functions in behavior, but are quite different syntactically. They will save developers time and simplify function scope. The following code takes a list

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Posted in ES6, JavaScript

ES6 variable declaration – let and const

In standard Javascript, the only way to declare a variable in JavaScript was to use the keyword var. But, in ES6 there are now two new ways to declare variables in JavaScript: let and const. let and const have some other interesting properties. Variables

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Posted in ES6, JavaScript

Example Program to combine arrays in ES6

Here is one example of when the spread operator can be useful is when combining arrays. If you’ve ever needed to combine multiple arrays, prior to the spread operator, you were forced to use the Array’s concat() method. const fruits = [“apples”,

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Posted in ES6, JavaScript

ES6 Spread Operator

The spread operator, written with three consecutive dots ( … ), is new in ES6 and gives you the ability to expand, or spread, iterable objects into multiple elements.

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Posted in ES6, JavaScript

ES6 for…of Example Program – Replace first letter of String with Uppercase

Below example iterates days array using for…of operation in ES6 and replaces the first character of the day with upper case. /* * Programming Quiz: Writing a For…of Loop (1-4) */ const days = [‘sunday’, ‘monday’, ‘tuesday’, ‘wednesday’, ‘thursday’, ‘friday’,

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Posted in ES6, JavaScript

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November 2019
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Mallikarjun Gunda

This is Mallikarjun Gunda, I am working as a software professional. Blogging is my Passion. This blog contains the posts on Java related technologies and programming languages. I am happy to share my knowledge through the blogs.

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