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let cids = $el.find('.alignment-row').map((row) => $(row).attr('data-id'));

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cids = ($(row).attr('data-id') for row in $el.find('.alignment-row'))

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const colors = getMarkers().map((marker) => marker.color);

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var colors, marker;
colors = (function() {
  var i, len, ref, results;
  ref = getMarkers();
  results = [];
  for (i = 0, len = ref.length; i < len; i++) {
    marker = ref[i];
    results.push(marker.color);
  }
  return results;

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colors = (marker.color for marker in getMarkers())

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class Giraffe {
  if (ENABLE_LOUD_GIRAFFES) {
    roar() {  // <- Unexpected token, expected ; (3:11)
      return 'ROAR!!!';
    }
  } else {
    roar() {
      return 'roar...';
    }
  }

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class Giraffe
  if ENABLE_LOUD_GIRAFFES
    roar: ->
      return 'ROAR!!!'
  else
    roar: ->
      return 'roar...'

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Example from repos/atom/atom/src/main-process/spawner.coffee:
  29 |   spawnedProcess.on 'close', (code, signal) ->
  30 |     error ?= new Error("Command failed: #{signal ? code}") if code isnt 0
> 31 |     error?.code ?= code
     |     ^^^^^^^^^^^
  32 |     error?.stdout ?= stdout
  33 |     callback?(error, stdout)


Example from repos/atom/atom/src/main-process/spawner.coffee:

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Example from repos/atom/atom/spec/atom-environment-spec.coffee:
  637 | 
  638 |     afterEach ->
> 639 |       subscription?.dispose()
      |       ^^^^^^^^^^^^^^^^^^^^^
  640 | 
  641 |     it "invokes onUpdateAvailable listeners", ->


Example from repos/atom/atom/spec/atom-reporter.coffee:

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/**
 * jscodeshift script to convert our way of creating React elements in CoffeeScript to
 * React.createElement. The create-element-to-jsx script then converts the result to JSX.
 *
 * For example, this code:
 * rd.div(myProps, child1, child2)
 *
 * becomes:
 * React.createElement('div', myProps, child1, child2)
 *