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// ES6

// example 1
([param] [, param]) => {
  statements
}

// example 2
param => expression

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// ES5

// example 1
function ([param] [, param]) {
  statements
}

// example 2
function (param) {
  return expression

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function People() {
  var self = this; // Some choose `that` instead of `self`.
  self.size = 0;

  setInterval(function addMorePeople() {
    // The callback refers to the `self` variable of which
    // the value is the expected object.
    self.size++;
  }, 1000);
}

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function People() {
  this.size = 0;

  setInterval(() => {
    this.size++;
  }, 1000);
}

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(param1, param2) => expression

// equivalent to: { return expression; }

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var someArray = [1, 2, 3, 4]

someArray.map( num => num + 1);

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function() { }.bind(this)

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access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>

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filename = "resume.pdf"
uri      = URI.parse(“https://someresume.com/resume.pdf”)
candidate.resume.attach(io: uri.open, filename: filename)

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// String literal example
type Easing = "ease-in" | "ease-out";