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JavaScript - check if map contains key
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In this article, we would like to show you how to check if a Map contains a key using JavaScript.
Quick solution:
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mapName.has('key');
In this example, we use has() method to check if Map contains the specific key.
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const myMap = new Map([2
['key1', 'value1'],3
['key2', 'value2'],4
['key3', 'value3'],5
]);6
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console.log(myMap.has('key1')); // true8
console.log(myMap.has('key4')); // falseOutput:
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true2
false