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Why functional languages? [closed]

I see a lot of talk on here about functional languages and stuff. Why would you use one over a "traditional" language? What do they do better? What are they worse at? What's the ideal functional programming application? ...
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IPN vs PDT in Paypal

... some trouble choosing between PayPal's Instant Payment Notification (IPN) and Payment Data Transfer (PDT). 3 Answers ...
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How do Trigonometric functions work?

So in high school math, and probably college, we are taught how to use trig functions, what they do, and what kinds of problems they solve. But they have always been presented to me as a black box. If you need the Sine or Cosine of something, you hit the sin or cos button on your calculator and you'...
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Relation between CommonJS, AMD and RequireJS?

I'm still very confused about CommonJS, AMD and RequireJS , even after reading a lot. 6 Answers ...
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What's the difference between Git Revert, Checkout and Reset?

I am trying to learn how to restore or rollback files and projects to a prior state, and don't understand the difference between git revert , checkout , and reset . Why are there 3 different commands for seemingly the same purpose, and when should someone choose one over the other? ...
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Using success/error/finally/catch with Promises in AngularJS

I'm using $http in AngularJs, and I'm not sure on how to use the returned promise and to handle errors. 6 Answers ...
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“CAUTION: provisional headers are shown” in Chrome debugger

...r Latest Versions of chrome Type chrome://net-export/ in the address bar and hit enter. Start Recording. And save Recording file to local. Open the page that is showing problems. Go back to net-internals You can view Recorded Log file Here https://netlog-viewer.appspot.com/#import click on events ...
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Why is there a `null` value in JavaScript?

...pt, there are two values which basically say 'I don't exist' - undefined and null . 12 Answers ...
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What's the difference between the data structure Tree and Graph?

... speaking, what's the essential difference between the data structure Tree and Graph? And how about the tree based search and Graph based search? ...
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Creating a “logical exclusive or” operator in Java

Java has a logical AND operator. Java has a logical OR operator. Java has a logical NOT operator. 17 Answers ...