JS:- https://www.w3resource.com/javascript-exercises/javascript-basic-exercises.php * https://career.guru99.com/top-85-javascript-interview-questions/ https://github.com/nishant8BITS/123-Essential-JavaScript-Interview-Question. https://www.doppnet.com/10-advanced-javascript-interview-questions.html https://mindmajix.com/javascript-interview-questions https://www.quora.com/What-data-structures-should-I-know-as-a-full-stack-JavaScript-developer https://www.quora.com/What-are-the-most-important-JavaScript-concepts-to-know-for-a-job-interview
- Call() & apply() & bind() => https://www.codementor.io/niladrisekhardutta/how-to-call-apply-and-bind-in-javascript-8i1jca6jp#call-or-functionprototypecall
https://www.w3schools.com/js/js_function_call.asp
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Closures => http://javascriptissexy.com/understand-javascript-closures-with-ease/
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Scope and context management => https://blog.kevinchisholm.com/javascript/difference-between-scope-and-context/
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Performance => http://www.monitis.com/blog/30-tips-to-improve-javascript-performance/
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Hoisting => https://www.w3schools.com/js/js_hoisting.asp
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this => http://www.tutorialsteacher.com/javascript/this-keyword-in-javascript
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Asynchronous Nature of JavaScript (Event loop) =>*(search with this heading) https://www.pluralsight.com/guides/front-end-javascript/introduction-to-asynchronous-javascript
https://stackoverflow.com/questions/21607692/understanding-the-event-loop
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Object Oriented JavaScript (OOP in JavaScript) https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_JS
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promise https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise https://coligo.io/javascript-promises-plain-simple/ https://scotch.io/tutorials/javascript-promises-for-dummies
10)callback() https://www.w3schools.com/jquery/jquery_callback.asp
11)How to avoid callback(); http://callbackhell.com/ http://www.dotnetfunda.com/interviews/show/10801/what-is-callback-hell-and-how-can-it-be-avoided https://stackoverflow.com/questions/41290885/how-to-avoid-callback-hell
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Difference b/w http and webscokets https://www.developerinsider.in/difference-between-http-and-http-2-0-websocket/
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coding questions https://performancejs.com/post/hde6d32/The-Best-Frontend-JavaScript-Interview-Questions-%28written-by-a-Frontend-Engineer%29 https://dev.to/maxpou/typical-javascript-interview-exercises-explained
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Difference Between var, let, and const Keywords in JavaScript https://dzone.com/articles/javascript-difference-between-var-let-and-const-ke
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what is the difference between cookie and session https://stackoverflow.com/questions/6339783/what-is-the-difference-between-sessions-and-cookies-in-php
16)https://www.sitepoint.com/shorthand-javascript-techniques/
17)difference between es5 and es6 javascript https://codeburst.io/es5-vs-es6-with-example-code-9901fa0136fc https://www.quora.com/What-is-the-difference-between-JavaScript-and-ES6 http://developmentr.com/javascript/2015/12/31/javascript-es6.html
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var sttr = "chandra" ; console.log(sttr.split('cha').pop()); && console.log(sttr.substring(0,3)); && var nb ="chandu"; console.log(nb.substring(0,1));console.log(nb.substring(1,nb.length));
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traingel , square , cirle , prime or not , fibanocci , assending , leapYearOrNot , dateFormat, Quick sort, Merge sort , Heap sort ,Insertion sort , Bubble sort , factorial , find the unique elements from two arrays , to move an array element from one position to another , to check whether an
inputis an array or not , o join all elements of the following array into a string , to find the most frequent item of an array , to remove duplicate items from an array , to perform a binary search , to compute the sum of each individual index value from the given arrays ,to find the difference of two arrays , to find the longest common starting substring in a set of strings , reverse a number & String , string is palindrome or not , Asending order and Desending order , first letter of each word of the string in upper case , Find the longest word within the string ,counts the number of vowels within the string , ake an array of numbers stored and find the second lowest and second greatest numbers , to find 1st January is being a Sunday between 2014 and 2050 , to get the extension of a filename , to replace every character in a given string with the character following it in the alphabet , to convert the letters of a given string in alphabetical order , to count the number of vowels in a given string. , to find the number of even digits in a given integer ,to convert a decimal number to binary, hexadecimal or octal number , to find the highest & lowest value in an array , to check to check whether a variable is numeric or not ,
function primeNumOrNoT(num){
if(num === 1){return false;}
else if(num === 2){return true;}
else {
for(var x=2; x < num; x++ ){
if(num % 2 === 0){return false}
}
return true;
}
};
//================= 5 )- fibonaci series+++++++ the first two Fibonacci numbers are 0 and 1, and each subsequent number is the sum of the previous two.
// Its recurrence relation is given by Fn = Fn-1 + Fn-2.
function fibonaciSeries(num){
var fibo = [];
fibo[0] = 0;
fibo[1] = 1;
for(var i=2; i<= num ; i++){
fibo[i] = fibo[i-1] + fibo[i-2];
console.log(fibo[i]);
}
};
////================= 6 )- factorial ++++++
function factorial(num){
if(num === 0){ return 1}
return num * factorial(num - 1);
}
////================= 7 )- PailndromeOrNot ++++++
function pailndromeOrNot(str){
var pail= str.split("").reverse().join("");
if(str == pail){return true}
return false;
}
////================= 8 )- Asending and Desending Order ++++++
function asendingOrder(array1){
var asendingOrder = array1.sort(function(a,b){return a-b});
console.log(" --- asendingOrder --- " +asendingOrder );
};
function desendingOrder(array1){
var desendingOrder = array1.sort(function(a,b){return b-a});
console.log(" --- desendingOrder --- " +desendingOrder );
};
////================= 9 )- leapYearOrNot ++++++
function leapYearOrNot(year) {
x = (year % 100 === 0) ? (year % 400 === 0) : (year % 4 === 0);
console.log(x);
};
////================= 10 )- dateFormat ++++++
function dateFormat() {
var date = new Date();
console.log(date);
var yyyy = date.getFullYear();
var mm = date.getMonth();
var dd = date.getDate();
var day = date.getDay();
var weeks = ["Mon","Tue" ,"Wed","Thu","Fri","Sat"];
console.log(mm + "/" + dd + "/" + yyyy);
console.log("day -- "+weeks[day]);
};
////================= 11 )- Find Unique num in two arrays ++++++
function findUniqueValuesInArray(arr1, arr2){
let unique1 = arr1.filter((o) => arr2.indexOf(o)=== -1);
let unique2 = arr2.filter((o) => arr1.indexOf(o) === -1);
var unique = unique1.concat(unique2);
console.log(unique);
}
////================= 12 )- to move an array element from one position to another ++++++
function array_move(arr, old_index, new_index) {
if (new_index >= arr.length) {
var k = new_index - arr.length + 1;
while (k--) {
arr.push(undefined);
}
}
arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
return arr;
};
////================= 13 )- to check whether an input is an array or not ++++++
function isArray(arr1){
if(toString.call(arr1) === "[object Array]" ){return true}
return false;
};
////================= 14 )- to join all elements of the following array into a string
function toJoinArrayIntoString(arr1){
var finalOutPut = arr1.toString();
var some = arr1.join("+");
console.log(some);
}
////================= 15 )- to remove duplicate items from an array eg:- console.log(new Set(arr1));
function removeDuplicates(arr){
let unique_array = []
for(let i = 0;i < arr.length; i++){
if(unique_array.indexOf(arr[i]) == -1){
unique_array.push(arr[i])
}
}
return unique_array
};
//================= 16 )- Find 1st January is being a Sunday between 2014 and 2050.
function findFirstSunday(startYear, endYear) {
console.log('--------------------');
for (var year = startYear; year <= endYear; year++)
{
var d = new Date(year, 0, 1);
if (d.getDay() === 0)
console.log("1st January is being a Sunday " + year);
}
console.log('--------------------');
}
//================= 17 )- reverse a number & String
function reverse(input){
var op = input.split("").reverse().join("");
console.log(op);
}
//================= 18 )- first letter of each word of the string in upper case
function uppercase(str) {
var array1 = str.split(' ');
var newarray1 = [];
for(var x = 0; x < array1.length; x++){
newarray1.push(array1[x].charAt(0).toUpperCase()+array1[x].slice(1));
}
return newarray1.join(' ');
}
document.writeln("<br/>navigator.appCodeName: " + navigator.appCodeName);
document.writeln("<br/>navigator.appName: " + navigator.appName);
document.writeln("<br/>navigator.appVersion: " + navigator.appVersion);
document.writeln("<br/>navigator.cookieEnabled: " + navigator.cookieEnabled);
document.writeln("<br/>navigator.language: " + navigator.language);
document.writeln("<br/>navigator.userAgent: " + navigator.userAgent);
document.writeln("<br/>navigator.platform: " + navigator.platform);
document.writeln("<br/>navigator.onLine: " + navigator.onLine);
function strPostion() {
var arr1 = ["king", "queen", "minister", "quiz"];
var str = ""
for (i = 0; i <= arr1.length; i++) {
console.log(arr1[i]);
str = arr1[i]
if (str.substring(0, 1) == "q") {
console.log("---- " + str);
}
}
}
</script>
</body>
mongodb, documents , difference b/w sql and non sql , aggregation , sharding , replication , CRUD operations , why we use mongoose, what is the use of mongoose , Ad hoc queries , indexing , yield
https://www.mongodb.com/what-is-mongodb https://www.javatpoint.com/sql-vs-nosql https://docs.mongodb.com/manual/aggregation/ https://docs.mongodb.com/manual/sharding/ https://docs.mongodb.com/manual/replication/ https://docs.mongodb.com/manual/crud/ https://stackoverflow.com/questions/18531696/why-do-we-need-what-advantages-to-use-mongoose https://code.tutsplus.com/articles/an-introduction-to-mongoose-for-mongodb-and-nodejs--cms-29527 https://www.pcmag.com/encyclopedia/term/37486/ad-hoc-query https://stackoverflow.com/questions/6576664/nosql-adhoc-queries-millions-of-rows https://www.simplilearn.com/indexing-and-aggregation-mongodb-tutorial-video https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/yield
angular2 , component and modules,template , Directives, dependecy injection , routing , input and output , observers , how to pass the data in one component to another, lazyloading , forms using react.
https://angular.io/docs https://www.tutorialspoint.com/angular2/angular2_components.htm https://www.tutorialspoint.com/angular2/angular2_modules.htm https://www.tutorialspoint.com/angular2/angular2_templates.htm https://www.tutorialspoint.com/angular2/angular2_directives.htm https://www.tutorialspoint.com/angular2/angular2_dependency_injection.htm https://scotch.io/tutorials/routing-angular-2-single-page-apps-with-the-component-router https://www.sitepoint.com/angular-2-components-inputs-outputs/ https://angular-2-training-book.rangle.io/v/v2.3/handout/observables/using_observables.html https://angularfirebase.com/lessons/sharing-data-between-angular-components-four-methods/ https://toddmotto.com/passing-data-angular-2-components-input https://stackoverflow.com/questions/34088209/how-to-pass-object-from-one-component-to-another-in-angular-2 https://angular-2-training-book.rangle.io/v/v2.3/handout/modules/lazy-loading-module.html https://medium.com/aviabird/complete-angular2-guide-reactive-forms-in-depth-part-1-21a8e2428904