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Factory pattern is very ubiquitous design pattern which finds its uses in most of the design strategy. In this post we will use factory with Decorator and demonstrate - how decorator can be used along side of factory and provide extra functionality wi…

Angular provides filtering capability which can be converting string from lower case to uppercase, converting time to Date or Sort(increasing or decreasing) an array based on some attributes. In this post we will see how to write custom filter - Filte…

I applied in Walmart Labs through employee referral, next day got call from HR and asked me to brief about my work and how much I am interested in relocating Bangalore. He informed they will schedule interview (Telephonic) next week.Whole interview p…

Singleton design pattern is intended to create only one instance of given class in context of given class loader (class loader which loads this given class). i.e: One instance per class loader. This post will discuss how to exploit a Singleton class w…

Interviewed for Senior Engineer Level.   Round-1: This round was all about thread followed by some puzzle and java concept!! Q1. It started with couple of basic questions about threads. Q2. Sample code how do we achieve threading in java - Implem…

Write an algorithm that collapses a list of Iterators into a single Iterator.  package javacore ; import java.util.ArrayList ; import java.util.Arrays ; import java.util.Iterator ; import java.util.List ; public class CollapseIterator…

Sample Data:-   Use following data set 1 and data set-2 for classifier using least square approach Data Set -1 Data Set -2 Problem statement  :- Sample program to find the linear classifier using least square approach. import sys import …

The perceptron is a linear classifier, therefore it will never get to the state with all the input vectors classified correctly if the training set D is not linearly separable, i.e. if the positive examples can not be separated from the negative examp…