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amorphobia/append.swift

Created May 31, 2019 02:18
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Swift: Append an element to an array which is a value of a dictionary, creating a new array if needed
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append.swift
var dict = [1: [11, 13, 15], 2: [23, 24]]
dict[3, default: []].append(39)
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Note

Do not use this subscript to modify dictionary values if the dictionary’s Value type is a class. In that case, the default value and key are not written back to the dictionary after an operation.

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