Swift Learning Notes (22)--basic operation of the dictionary

(1) Calculating the dictionary length

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(2) Determine if the dictionary is empty

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(3) Querying dictionary elements

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(4) Remove the dictionary elements for stitching

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(5) Insert a key value pair in the dictionary

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(6) The dictionary modifies a key value pair

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(7) Updating element values using methods

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In fact, the above method also has a return value:

(8) Remove an element from the dictionary

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Swift Learning Notes (22)--basic operation of the dictionary