In Swift 3, the <code>String</code> structure does not seem to have an initializer <code>init(_: Int)</code> that will allow the conversion from an <code>Int</code> to a <code>String</code>. My question is why does <code>let i = String(3)</code> work? What <code>String</code> method or initializer is it calling? Thanks.

It's calling <code>init(_:)</code> (or <code>init(_:)</code> for <code>UnsignedInteger</code>) arguments of the <code>String</code> class. Rather than defining separate initializers for <code>Int</code>, <code>Int64</code>, <code>Int32</code>, <code>Int16</code>, <code>Int8</code>, <code>UInt</code>, <code>UInt64</code>, <code>UInt32</code>, <code>UInt16</code>, and <code>UInt8</code>, Apple made two generic initializers: one for <code>SignedInteger</code> types, and one for <code>UnsignedInteger</code> types.

Swift 3 conversion from Int to String

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string

swift3

In Swift 3, the String structure does not seem to have an initializer init(_: Int) that will allow the conversion from an Int to a String. My question is why does let i = String(3) work? What String method or initializer is it calling? Thanks.

468

asked Oct 22 '16 23:10

Don Giovanni

1 Answers

It's calling init(_:) (or init(_:) for UnsignedInteger) arguments of the String class.

Rather than defining separate initializers for Int, Int64, Int32, Int16, Int8, UInt, UInt64, UInt32, UInt16, and UInt8, Apple made two generic initializers: one for SignedInteger types, and one for UnsignedInteger types.