# IntegerParseStrategy A parse strategy for creating integer values from formatted strings. ``` struct IntegerParseStrategy where Format : FormatStyle, Format.FormatInput : BinaryInteger ``` ## Overview Create an explicit [`IntegerParseStrategy`](/documentation/Foundation/IntegerParseStrategy) to parse multiple strings according to the same parse strategy. In the following example, `usCurrencyStrategy` is an [`IntegerParseStrategy`](/documentation/Foundation/IntegerParseStrategy) 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: IntegerParseStrategy = IntegerFormatStyle.Currency(code: "USD", locale: Locale(identifier: "en_US")) .parseStrategy let currencyValues = ["$100", "$1,000", "$10,000", "€100"] let parsedValues = currencyValues.map { try? usCurrencyStrategy.parse($0) } // [Optional(100), Optional(1000), Optional(10000), 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" let parsedUSDollars = try? Int(formattedUSDollars, format: .currency(code: "USD") .locale(Locale(identifier: "en_US"))) // 1234 ``` ## Topics ### Creating an integer parse strategy [`init(format: Format, lenient: Bool)`](/documentation/Foundation/IntegerParseStrategy/init(format:lenient:)-124xn) Creates a parse strategy instance using the specified integer format style. [`init(format: Format, lenient: Bool)`](/documentation/Foundation/IntegerParseStrategy/init(format:lenient:)-7tox3) Creates a parse strategy instance using the specified integer currency format style. [`init(format: Format, lenient: Bool)`](/documentation/Foundation/IntegerParseStrategy/init(format:lenient:)-3gbvo) Creates a parse strategy instance using the specified integer percentage format style. ### Parsing strings [`func parse(String) throws -> Format.FormatInput`](/documentation/Foundation/IntegerParseStrategy/parse(_:)) Parses an integer string in accordance with this strategy and returns the parsed value. ### Accessing strategy properties [`var formatStyle: Format`](/documentation/Foundation/IntegerParseStrategy/formatStyle) The format style this strategy uses when parsing strings. [`var lenient: Bool`](/documentation/Foundation/IntegerParseStrategy/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/IntegerParseStrategy/ParseStrategy-Implementations) ## Relationships ### Conforms To [`Copyable`](/documentation/Swift/Copyable) [`Equatable`](/documentation/Swift/Equatable) [`ParseStrategy`](/documentation/Foundation/ParseStrategy) [`Hashable`](/documentation/Swift/Hashable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Decodable`](/documentation/Swift/Decodable) [`Escapable`](/documentation/Swift/Escapable) [`Encodable`](/documentation/Swift/Encodable) [`Sendable`](/documentation/Swift/Sendable) --- 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)