Adding paypal checkout to your 3rd-party shopping cart

  
  <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">

  <input type="hidden" name="" value="_cart">

  <input type="hidden" name="" value="1">

  <input type="hidden" name="email" value="write@email">

  <% var num = 0; %>

  <% cart.forEach(function(pp){ %>

  <% num++ %>

  <input type="hidden" name="item<%= num %>" value="<%= p.title %>" >

  <input type="hidden" name="amount_<%= num %>" value="<%= p.price %>" >

  <input type="hidden" name="quantity_<%= num %>" value="<%= p.qty %>" >

  <% }); %>

  <input type="hidden" name="currency" value="USD">

  <input type="hidden" name="amount" value="<%= total %>">

  <input type="image" src="http://www.paypal.com/en_US/i/btn/x-click-but01.gif" 

  name="submit" alt="">

  </form>

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Javascript: Object to Array and Array to Object

Output: Final Array [ { mango: 1 }, { apple: 2 }, { banana: 3 }, { orange: 1 }, { watermelon: 1 }, { papaya: 1 } ] Output: Final Object { mango: 1, apple: 2, banana: 3, orange: 1, watermelon: 1, papaya: 1 }

Javascript: Callback and High Order Function

CALLBACK A callback is a function that gets invoked after an asynchronous result appears. a callback function is an async function argument. - Asynchronous code result handle using callback and promises. // callback function function with argument // ---argument :// if a function pass-through function as an argument, it is higher-order function. function needs to be called in order to execute. a callback is used when calling a function asynchronous What is a Callback or Higher-order Function? A callback function , also known as a higher-order function, is a function that is passed to another function (let’s call this other function “otherFunction”) as a parameter, and the callback function is called (or executed) inside the otherFunction. A callback function is essentially a pattern (an established solution to a common problem), and therefore, the use of a callback function is also known as a callback pattern. High-order function is a function that takes ...

Javascript Conference: Functional- Map, Reduce and Filter vs Object Oriented Programming

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