# FloatingPointParseStrategy A parse strategy for creating floating-point values from formatted strings. ``` struct FloatingPointParseStrategy where Format : FormatStyle, Format.FormatInput : BinaryFloatingPoint ``` ## Overview Create an explicit [`FloatingPointParseStrategy`](/documentation/Foundation/FloatingPointParseStrategy) to parse multiple strings according to the same parse strategy. In the following example, `usCurrencyStrategy` is a [`FloatingPointParseStrategy`](/documentation/Foundation/FloatingPointParseStrategy) that uses US dollars and the `en_US` locale’s conventions for number formatting. The example then uses this strategy to parse an array of strings, some of which represent valid US currency values. ```swift let usCurrencyStrategy: FloatingPointParseStrategy = FloatingPointFormatStyle.Currency(code: "USD", locale: Locale(identifier: "en_US")) .parseStrategy let currencyValues = ["$100.11", "$1,000.22", "$10,000.33", "€100.44"] let parsedValues = currencyValues.map { try? usCurrencyStrategy.parse($0) } // [Optional(100.11), Optional(1000.22), Optional(10000.33), nil] ``` You don’t need to instantiate a parse strategy variable to parse a single string. Instead, use the initializers that take a source and a `format` parameter to parse the string according to the provided [`FormatStyle`](/documentation/Foundation/FormatStyle). The following example parses a string that represents a currency value in US dollars. ```swift let formattedUSDollars = "$1,234.56" let parsedUSDollars = try? Double(formattedUSDollars, format: .currency(code: "USD") .locale(Locale(identifier: "en_US"))) // 1234.56 ``` ## Topics ### Creating a floating-point parse strategy [`init(format: Format, lenient: Bool)`](/documentation/Foundation/FloatingPointParseStrategy/init(format:lenient:)-5nxey) Creates a parse strategy instance using the specified floating-point format style. [`init(format: Format, lenient: Bool)`](/documentation/Foundation/FloatingPointParseStrategy/init(format:lenient:)-9g6wm) Creates a parse strategy instance using the specified floating-point currency format style. [`init(format: Format, lenient: Bool)`](/documentation/Foundation/FloatingPointParseStrategy/init(format:lenient:)-1nldg) Creates a parse strategy instance using the specified floating-point percentage format style. ### Parsing strings [`func parse(String) throws -> Format.FormatInput`](/documentation/Foundation/FloatingPointParseStrategy/parse(_:)) Parses a floating-point string in accordance with this strategy and returns the parsed value. ### Accessing strategy properties [`var formatStyle: Format`](/documentation/Foundation/FloatingPointParseStrategy/formatStyle) The format style this strategy uses when parsing strings. [`var lenient: Bool`](/documentation/Foundation/FloatingPointParseStrategy/lenient) A Boolean value that indicates whether parsing allows any discrepencies in the expected format. ### Applying date-parsing strategies ### Supporting types ### Default Implementations [ParseStrategy Implementations](/documentation/Foundation/FloatingPointParseStrategy/ParseStrategy-Implementations) ## Relationships ### Conforms To [`Copyable`](/documentation/Swift/Copyable) [`ParseStrategy`](/documentation/Foundation/ParseStrategy) [`Encodable`](/documentation/Swift/Encodable) [`Decodable`](/documentation/Swift/Decodable) [`Escapable`](/documentation/Swift/Escapable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) [`Hashable`](/documentation/Swift/Hashable) [`Equatable`](/documentation/Swift/Equatable) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)