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TypeConstructor Main.Person
Error:
Error in module Main:
Error in value declaration name:
Error checking that type
  Main.Person
subsumes type
  Prim.Int -> Main.Person
Error at /home/michael/dev/contrib/purescript/examples/failing/CaseDoesNotMatchAllConstructorArgs.purs line 12, column 17 - line 12, column 34:
  Cannot unify type

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a / b * b + (a mod b) = a

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

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Example failing with multiple counters:

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List comprehensions

[i for i in xrange(1, 20) if i % 3 == 0]

Dot

foo.bar()

In Object Oriented programming, send the message "bar" to foo

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var deepProperty = function (properties) {
      return function (obj) {
        return properties.reduce(function (obj, key) {
            return obj[key];
          }, obj);
      };
    };

deepProp(['a', 'b', 'c'])({ a: { b: { c: 42 } }}) // => 42

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'use strict';

const buildMatcher = (cases) => (actual) =>
  cases
    .find((cse) => cse.matches(actual))
    .result(actual);

const buildNextOn = (previousCases) => {
  var build = (matchesPred, result) => {
    const cases = previousCases.concat(

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# Simple file IO
```python
with open('somefile.txt', 'w') as file:
  file.write('foobar')

with open('somefile.txt', 'r') as file:
  text = file.read()

print text
# => foobar

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  function compose() {
    return Array
      .prototype
      .slice
      .call(arguments)
      .reduce(compose2, identity);
  }

  function compose2(f, g) {
    return function (x) {

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Lambda Calculus

A programming language, with ONLY functions.

Consists of

• Name (kind of like a variable)
• Lambda functions (kind of like normal functions)
• Application (how we apply functions)

Terms: