Question

How to remove nil (null) from a dictionary in Swift

Answer 1

import Foundation

var dict:[String:Int?] = ["swift": nil, "c": 3, "c++": nil, "python": 2, "java": nil]

print("Original values: ", dict)

/*
The filter function iterates over each key-value pair.
$0 refers to a tuple (key, value), $0.1 accesses the value part.
It keeps only those pairs where the value isn’t nil.
*/

// Removing nil 
dict = dict.filter{$0.1 != nil}

print("Dictionary without nil (null) values: \(dict)")



/*
run:

Original values:  ["swift": nil, "c++": nil, "python": Optional(2), "java": nil, "c": Optional(3)]
Dictionary without nil (null) values: ["c": Optional(3), "python": Optional(2)]

*/

 

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