Methods to select sublayers of a given layer using substrings

select-children-methods.coffee

# This method will return the first resulting child layer containing a specified substring
Layer.prototype.childContaining = (str) ->
	for layer in @children
		return layer if layer.name.indexOf(str) != -1
	return -1

# This method will return an array of child layers containing a specified substring
Layer.prototype.childrenContaining = (str) ->
	layers = []
	for layer in @children
		layers.push(layer) if layer.name.indexOf(str) != -1
	return layers
	
# This method will return the first resulting child layer whose name begins with a specified string
Layer.prototype.childStartingWith = (str) ->
	for layer in @children
		return layer if layer.name.indexOf(str) == 0
	return -1

# This method will return an array of child layers whose names begin with a specified string
Layer.prototype.childrenStartingWith = (str) ->
	layers = []
	for layer in @children
		layers.push(layer) if layer.name.indexOf(str) == 0
	return layers