Please find the source and instructions @ https://github.com/kartheekgj/paypalnodeIntegration
Educate And Advocate
All about very small logical and programming problems. Complex theories made simple to understand
Tuesday, September 7, 2021
Async Await Simple example
let url1 = "https://reqres.in/api/users";
async function users() {
let response = await fetch(url1);
let user = await response.json();
return user;
};
let singleUrl = "https://reqres.in/api/users/";
async function userData(data) {
let url = singleUrl + data;
let response = await fetch(url);
let user = await response.json();
return user;
};
users().then(respData => {
console.log(respData.data);
var userid = respData.data[0]['id']
userData(userid).then((responseData) => {
console.log(responseData);
});
});
Thursday, August 28, 2014
Example for Closure, .call, .apply in javascript
function add(y,z){
function fn(x,y,z){
console.log(Math.round(x+y)*z);
};
fn(this.x,y,z);
};
add.call({x: 20.1},3.1,5.1); // 117.3
add.apply({x: 20.1},[3.1,5.1]); // 117.3
Wednesday, July 30, 2014
Strangest things i found in JavaScript
- [] + []; // ""
- {} + {}; // NaN
- [] + {}; // "[object Object]"
- {} + []; // 0
- [] == []; // false
- [] < []; // false
- [] > []; // false
- [] <= []; // true
- [] >= []; //true
- Math.min() < Math.max(); // false
- foo = [0];
- !foo; // false
- foo == foo; // true
- foo == !foo; // true
- [['0']] == false; // true
- [['0']] == true; // false
- typeof NaN; // "number"
- NaN == true; // false
- NaN == false; // false
- NaN != true; // true
- NaN != false; // true
- NaN == NaN; // false
- NaN == !NaN; // false
- !NaN; // true
- NaN != NaN; // true
- 'x' == true; // true
- 'x' == false; // false
- '0' == true; // false
- '0' == false; // true
Friday, July 25, 2014
Couple of interview questions
Write a function that takes an integer (i) and prints out the first 'i' rows of Pascal's Triangle (eg. i =5).
line = 5;
var pascalDepth = parseInt(line, 10); //The input integer is provided on a single line as a text value, so this handles it.
var testTriangle = pascalTriangle(pascalDepth);
var output = [];
maxlength = testTriangle.length;
var html = "<table>"
for(var i = 0; i < maxlength; i++){
html += "<tr>";
html += "<td>";
html += testTriangle[i];
html += "</td>";
html += "</tr>";
}
html+= "</table>";
document.write(html);
function pascalTriangle(totalLines, triangle) {
if (typeof triangle === 'undefined') {
triangle = [];
}
if (triangle.length === totalLines) {
return triangle;
}
if (triangle.length > 0) {
var triangleLine = [];
for (var i = 0; i < triangle.length; i++) {
if (typeof triangle[triangle.length - 1][i - 1] === 'undefined') {
triangleLine.push(1);
} else {
triangleLine.push((triangle[triangle.length - 1][i - 1] + triangle[triangle.length - 1][i]));
}
}
triangleLine.push(1);
triangle.push(triangleLine);
} else {
triangle.push([1]);
}
return pascalTriangle(totalLines, triangle);
}
-----------------------------------------------------------------------------------------
var pascalDepth = parseInt(line, 10); //The input integer is provided on a single line as a text value, so this handles it.
var testTriangle = pascalTriangle(pascalDepth);
var output = [];
maxlength = testTriangle.length;
var html = "<table>"
for(var i = 0; i < maxlength; i++){
html += "<tr>";
html += "<td>";
html += testTriangle[i];
html += "</td>";
html += "</tr>";
}
html+= "</table>";
document.write(html);
function pascalTriangle(totalLines, triangle) {
if (typeof triangle === 'undefined') {
triangle = [];
}
if (triangle.length === totalLines) {
return triangle;
}
if (triangle.length > 0) {
var triangleLine = [];
for (var i = 0; i < triangle.length; i++) {
if (typeof triangle[triangle.length - 1][i - 1] === 'undefined') {
triangleLine.push(1);
} else {
triangleLine.push((triangle[triangle.length - 1][i - 1] + triangle[triangle.length - 1][i]));
}
}
triangleLine.push(1);
triangle.push(triangleLine);
} else {
triangle.push([1]);
}
return pascalTriangle(totalLines, triangle);
}
-----------------------------------------------------------------------------------------
Write a function that prints out a breakdown of an integer into a sum of numbers that have just one non-zero digit.
eg., given 43018 it should print 40000 + 3000 + 10 + 8.
var arr = [];
var i =1;
var a = 40118;
var input = 40118;
while(a > 0)
{
if(a%(Math.pow(10,i)) > 0)
arr.push(a%(Math.pow(10,i)));
a = a-a%(Math.pow(10,i++));
}
arr.sort(function(a,b){ return b-a;});
document.write(input +" = " +arr.join(" + "));
var i =1;
var a = 40118;
var input = 40118;
while(a > 0)
{
if(a%(Math.pow(10,i)) > 0)
arr.push(a%(Math.pow(10,i)));
a = a-a%(Math.pow(10,i++));
}
arr.sort(function(a,b){ return b-a;});
document.write(input +" = " +arr.join(" + "));
Thursday, July 17, 2014
Creating a URL shortner
Here is the actual code i have created using php its very simple and easy to use.
Here is the live Working url : http://shorturl-kartheekgj.rhcloud.com/
Please find the code at: https://github.com/kartheekgj/shorturl
Here is the live Working url : http://shorturl-kartheekgj.rhcloud.com/
Please find the code at: https://github.com/kartheekgj/shorturl
Wednesday, May 7, 2014
Swap 2 numbers without using third variable
This is a very very very simple question generally asked as first level of logical questions
Swap 2 numbers without using third variable
function fnSwap(a,b){
console.log("Initial value of a: "+ a);
console.log("Initial value of b: "+ b);
// swaping the values of a and b
b = a+b
a = b-a
b = b-a
console.log("Swaped value of a: "+ a);
console.log("Swaped value of b: "+ b);
}
Input:
fnSwap(10,20);
output:
Note:
It works with console if you are working with firefox install firebug to see output in console
if you install chrome/IE you can use f12 for console
Swap 2 numbers without using third variable
function fnSwap(a,b){
console.log("Initial value of a: "+ a);
console.log("Initial value of b: "+ b);
// swaping the values of a and b
b = a+b
a = b-a
b = b-a
console.log("Swaped value of a: "+ a);
console.log("Swaped value of b: "+ b);
}
Input:
fnSwap(10,20);
output:
Initial value of a: 10
Initial value of b: 20
Swaped value of a: 20
Swaped value of b: 10
Note:
It works with console if you are working with firefox install firebug to see output in console
if you install chrome/IE you can use f12 for console
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