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January 17, 2018 16:15
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Operator sugar for dictionary merge methods
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| extension Dictionary { | |
| /// Merges two dictionaries. | |
| /// When a key is present in both dictionaries, `lhs`'s keys are overwritten | |
| /// | |
| /// - Parameters: | |
| /// - lhs: The base dictionary. Its keys may be overwritten by `rhs`'s keys | |
| /// - rhs: The added dictionary. Its keys may overwrite `lhs`'s keys | |
| static func + (lhs: [Key: Value], rhs: [Key: Value]) -> [Key: Value] { | |
| return lhs.merging(rhs, uniquingKeysWith: { $1 }) | |
| } | |
| /// Merges two dictionaries. | |
| /// When a key is present in both dictionaries, `lhs`'s keys are overwritten | |
| /// | |
| /// - Parameters: | |
| /// - lhs: The base dictionary. Its keys may be overwritten by `rhs`'s keys | |
| /// - rhs: The added dictionary. Its keys may overwrite `lhs`'s keys | |
| static func += (lhs: inout [Key: Value], rhs: [Key: Value]) { | |
| lhs.merge(rhs, uniquingKeysWith: { $1 }) | |
| } | |
| } | |
| //let dict1 = ["key1": 1] | |
| //let dict2 = ["key2": 2] | |
| // | |
| //let d = dict1 + dict2 | |
| // | |
| //var c = dict1 | |
| //c += dict2 | |
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