JP-understanding-check

JP-understanding-check.md

Array Prototype Methods

• I understand that functions in JavaScript can take any number of arguments.

  • Yes, and arguments may be omitted.

• I can describe the similarity between blocks in Ruby and anonymous functions in JavaScript.

  • Yes, they're very similar conceptually. Both take in some data, perform logic on it, and give a return value.

• Where are the methods available to all arrays (e.g. forEach, map, etc.) defined?

  • In the Array.prototype.

• I can explain the difference between using a for loop and the forEach method.

  • While functionally they can achieve generally the same thing, the 'for' loop is sloppier with scope ('i' for example).

• I can explain the difference between forEach and map.

  • Map actually returns a new array based on the logic in the function without transforming the original array (as in Ruby).

• Can you explain the process of taking a plain JavaScript objects, transforming them into DOM nodes, and appending them to the page.

  • .createElement will allow you to create/format as needed, and using .append() will allow you to add your new elements to the page easily.

• How comfortable are you using the forEach() method?

  • Fairly comfortable. Sometimes I struggle with scope still, but this feels a lot like Ruby.

• How comfortable are you using the map() method?

  • Same as above. Feels like a familiar tool.

• How comfortable are you using the filter() method?

  • Pretty comfortable. Feels like Ruby's .select in spirit, although it doesn't function exactly the same way.

• How comfortable are you using the reduce() method?

  • Moderately comfortable. The syntax feels odd to me, but after using it a few times it's not bad. This is a tool that I don't reach for frequently enough.

• How comfortable are you using the sort() method?

  • Pretty comfortable. I actually used this in my IdeaBox before this lesson.

• How comfortable are you working with simple unit tests in Mocha in the browser?

  • Not very comfortable. I'm generally having problems with all aspects of testing in JavaScript.