Reasons why I prefer ruby and clojure to js

ex1a.js

className () {
  let className = 'purchase_orders_table';
  if (this.state.sticky) className += '--sticky';
  return className;
}

ex1b.clj

(defn class-name [state]
  (string "purchase_orders_table"
    (if (state :sticky) ("--sticky"))))

ex1c.rb

def class_name
  "purchase_orders_table#{'--sticky' if @state.sticky?}"
end

ex2a.js

renderCols () {
  const cellWidths = this.cellWidths();
  let cols = [];

  for (let i = 0; i < cellWidths.length; i++) {
    cols.push((
      <col key={i} style={{ width: cellWidths[i] }} />
    ));
  }

  return cols;
}

ex2b.clj

(defn render-columns []
  (map-indexed #(col {:key %1 :style {:width %2}}) (cell-widths)))

ex2c.rb

def render_columns
  cell_widths.each_with_index.map do |width, i|
    col(key: i, style: { width: width })
  end
end

ex3a.js

function removeEmptyKeys(object) {
  for (let key in object) {
    if (object.hasOwnProperty(key) && (object[key] == null || object[key] === '')) {
      delete object[key];
    }
  }

  return object;
}

ex3b.clj

(defn remove-empty-keys [map]
  (into {} (filter #(not (nil? (% 1))) map)))

ex3c.rb

def remove_empty_keys(hash)
  hash.keep_if { |_, v| !v.nil? }
end