How can I check if a value is of type Map in JavaScript?

user_9598207 0
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I have a variable that could be an Object, a Map, or neither. I can easily check for objects with typeof, but I need to conditionally Map.map() the variable if it is a Map, and typeof doesn't work with maps. Any suggestions?

node.js javascript
2 Answers

Use instanceof:

var map = new Map;
console.log(map instanceof Map);

user_139210230 
var foo = new Set;
foo instanceof Set; // True!
foo instanceof Map; // False!
user_44426060
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