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const insert = (item, index, array) =>
  [...array.slice(0, index), 
   ...item, 
   ...array.slice(index, array.length)];

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const sortedUnion = (a, b) => {
  const c = {};
  [...a, ...b].forEach(i => c[i] = i);
  return Object.keys(c);
};

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const remove = (index, array) => 
  [...array.slice(0, index), 
   ...array.slice(index + 1, array.length)];

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function debounce(fn, wait, immediate) {
  var timeout;
  return function() {
    var context = this, args = arguments;
    var later = function() {
	timeout = null;
	if (!immediate) fn.apply(context, args);
    };
    var callNow = immediate && !timeout;
    clearTimeout(timeout);

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function clone(obj) { return Object.create(obj); }

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def function_name (iterable, f): 
    for x in iterable:
        yield f(x)

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def function_name (iterable, f):
   for x in iterable:
       if f(x): yield x

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def function_name (iterable, f):
   result = None 
   for x in iterable:
       if f(x): 
            result = x
            break
   return result    

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def function_name (iterable): 
    return iterable[::-1]

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def function_name (iterable, f):
    result = False
    for x in iterable:
        if f(x):
            result = True
            break
    return result