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edited Dec 10, 2022 at 3:47Here's how you check if a map contains a key.
val, ok := myMap["foo"]// If the key existsif ok {// Do something}This initializes two variables. val is the value of "foo" from the map if it exists, or a "zero value" if it doesn't (in this case the empty string). ok is a bool that will be set to true if the key existed.
If you want, you can shorten this to a one-liner.
if val, ok := myMap["foo"]; ok {//do something here}Go allows you to put an initializing statement before the condition (notice the semicolon) in the if statement. The consequence of ...
Content Under CC-BY-SA license How to check if a map contains a key in Go? - Stack Overflow
WEBLonger Answer. Per the Maps section of Effective Go: An attempt to fetch a map value with a key that is not present in the map will return the zero value for the type of the entries in …
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