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function amountFormatter(val) {
	//formats a negative number with brackets (NN.NN)
	if (val !== null) {
	if(parseFloat(val) < 0){
		var newVal = val.replace(/-(?=\d)/,""); //remove minus sign -
		return '(' + newVal + ')';
		}else{
		return val;
		}
	}
}

Another example shows how UI5's built-in number formatters can be used from within a formatter function. In this case, a floating point number has its sign 'reversed', ie formats a positive number as a negative number, and vice-versa.

In the example the Amount field is a floating point number named DMBTR.

Instructions:

1. In the Advanced Property of the field DMBTR, set the binding as:

   text="{path : 'DMBTR',type : 'sap.ui.model.type.Float',formatOptions: { groupingEnabled : true, decimals: 0}, formatter: 'changeSignFormatter'}

2. In a Script node, create the function 'changeSignFormatter' as:

function changeSignFormatter(val) {
	//changes a number from a positive to a negative or vice-versa
	if (val !== null) {
		var oFormat = sap.ui.core.format.NumberFormat.getFloatInstance({
			groupingEnabed: true,
			decimals: 0
		});
		var rawVal = oFormat.parse(val);	//takes the given 'string' value float number (eg '-1,234.00') and converts to float
		var newVal = rawVal * -1; 
		return oFormat.format(newVal);
	}
}