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Ask the right questions to secure the right CoffeeScript talent among an increasingly shrinking pool of talent.
CoffeeScript is a programming language that compiles into JavaScript, conceived by Jeremy Ashkenas in 2009. It adds syntactic sugar inspired by Ruby, Python and Haskell to enhance JavaScript's brevity and readability. The language has been popular for web development due to its close relationship with JavaScript - one of the core technologies of the World Wide Web. CoffeeScript also influenced the development of later languages like TypeScript and Dart. Its source code was made available on GitHub, fostering an active community around it.
The next 20 minutes of the interview should attempt to focus more specifically on the development questions used, and the level of depth and skill the engineer possesses.
In CoffeeScript, the 'fat arrow' (=>) is used to define a function that is bound to the current value of 'this', while the 'thin arrow' (->) defines a function without binding 'this'. This is useful when working with callbacks or event handlers where the context is important.
Exceptions in CoffeeScript can be handled using the 'try/catch/finally' blocks, similar to JavaScript. The syntax is 'try expression catch error then expression'.
CoffeeScript has a more readable and succinct syntax, it has additional features not present in JavaScript like array comprehensions and destructuring assignment, and it helps to write safer JavaScript by preventing common mistakes.
You can compile a CoffeeScript file into JavaScript using the CoffeeScript compiler. The command is 'coffee --compile filename.coffee'. This will create a filename.js file with the compiled JavaScript.
CoffeeScript is a programming language that transcompiles to JavaScript. The main differences are: CoffeeScript has a cleaner syntax, it removes the need for semicolons and parentheses, it supports string interpolation, it has a safer scope handling with the use of 'do', and it has a more comprehensive loop and comprehension syntax.
Communication is key in any role, but especially in a developer role where the candidate will need to explain their process and solutions to others.
Technology is always changing, so it's important that the candidate is able to learn and adapt to new technologies and changes in CoffeeScript.
CoffeeScript is often used alongside other technologies, so it's important that the candidate understands how to use it in conjunction with others.
Being able to solve problems using CoffeeScript is crucial. This shows that the candidate can apply their knowledge of the language to real-world scenarios.
Experience is key in any role, and a candidate who has used CoffeeScript in a professional setting will likely be able to hit the ground running.
This is important because it's the foundation of writing code in CoffeeScript. Without a strong understanding of the language's syntax and structure, the candidate will struggle to write effective and efficient code.
The next 20 minutes of the interview should attempt to focus more specifically on the development questions used, and the level of depth and skill the engineer possesses.
Mixins in CoffeeScript can be implemented by extending the prototype of a class with the properties and methods of another object. The 'extend' function from Underscore.js or jQuery can be used for this purpose.
In CoffeeScript, '==' and '===' are replaced by 'is'. It checks for equality including type. '!=' and '!==' are replaced by 'isnt'. It checks for inequality. CoffeeScript does not have '==' and '===' operators.
In CoffeeScript, all methods are public by default. To create a private method, you can define it outside the class and then call it from within the class.
In CoffeeScript, the '@' symbol is a shorthand for 'this.'. It is used to refer to the current object. It can also be used in the constructor to automatically create instance variables.
In CoffeeScript, you can create a class using the 'class' keyword, followed by the name of the class. You can also define a constructor using the 'constructor' keyword. For example, 'class MyClass constructor: (@name) ->'.
A skilled CoffeeScript engineer should demonstrate proficiency in JavaScript as CoffeeScript is a JavaScript transcompiler. They should understand functional programming concepts, and have experience with web development frameworks. Red flags include inability to explain code compilation or lack of understanding of JavaScript nuances.
`x = 10``a = 5
b = 10
console.log a + b``arr = [1, 2, 3, 4, 5]
newArr = (num for num in arr when num % 2 == 0)``doSomething = () ->
setTimeout (-> console.log 'Hello'), 1000
console.log 'Goodbye'
doSomething()``class Animal
constructor: (@name) ->
class Dog extends Animal
bark: ->
console.log @name + ' barks!'``square = (x) -> x * x
numbers = [1, 2, 3, 4, 5]
squares = numbers.map square
console.log squares`The final few interview questions for a CoffeeScript candidate should typically focus on a combination of technical skills, personal goals, growth potential, team dynamics, and company culture.
Some of the best practices for error handling in CoffeeScript are: use 'try/catch/finally' blocks to handle exceptions, always check for existence before accessing properties or calling methods on an object, use the 'safe navigation operator' (?.) to avoid TypeError, and use the 'existential operator' (?) to check if a variable is null or undefined.
Inheritance in CoffeeScript can be implemented using the 'extends' keyword. For example, 'class Child extends Parent'. This will make Child inherit all the properties and methods of Parent.
CoffeeScript does not have 'let' and 'var'. Instead, it uses the '=' operator to declare variables. The scope of the variable is determined by the indentation level.
The 'splats' operator in CoffeeScript is used to handle function arguments that can be of any number. It can be used in function definition, function invocation, array literals and destructuring assignment.
The 'do' keyword in CoffeeScript is used to immediately invoke a function. It can also be used to create a new scope, which is useful to capture the current value of a variable in a loop.
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