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# YUI Library Examples: DataType Utility: DataType.Number.format()

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## DataType Utility: DataType.Number.format()

The Number module of the DataType Utility allows you to take a number and format it into a string with the following configuration parameters: `decimalPlaces`, `decimalSeparator`, `thousandsSeparator`, `prefix`, and `suffix`.

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Number to format:
Thousands separator: Decimal separator: Decimal places:
Prefix: Suffix:
:

To output a number as a string, simply call the `format()` function of the DataType.Number class:

YUI().use("datatype-number", function(Y) { alert(Y.DataType.Number.format(123123123)); // This alerts the string "123123123" }); The `format()` function also takes a variety of configuration parameters that manipulate the value of the string. This is helpful, for instance, when displaying numbers as currency: YUI().use("datatype-number", function(Y) { alert(Y.DataType.Number.format(123123123.176,{ prefix: "&#165;", thousandsSeparator: ".", decimalSeparator: ",", decimalPlaces: 2, suffix: " (YEN)" })); // This alerts the string "¥123.123.123,18 (YEN)" });

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