Usage of where in if let assignment in Swift Usage of where in if let assignment in Swift ios ios

Usage of where in if let assignment in Swift


ios swift where optional swift3

In Swift 3 this syntax has changed.

What was

if let x = y, a = b where a == x {

Is now

if let x = y, let a = b, a == x {

The justification is that each sub-clause of the if ... { is now an independent boolean test.

See the Xcode Release notes & the Swift Evolution proposal for more info about this change.

ios swift where optional swift3

Example with two conditions 

if let x = y, let a = b, a == x && !x.isEmpty {

ios swift where optional swift3

In xcode 9

if let str = textField.text as String!, !str.isEmpty{   params[key] = str   TextFieldHelper.setup(textField: textField)}else{    TextFieldHelper.error(textField: textField)}

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