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How to get the length of a JavaScript associative array?

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Sometimes, we want to get the length of a JavaScript associative array.

In this article, we’ll look at how to get the length of a JavaScript associative array.

How to get the length of a JavaScript associative array?

To get the length of a JavaScript associative array, we use the Object.keys method.

For instance, we write

const myObject = {};
myObject["q101"] = "Your name?";
myObject["q102"] = "Your age?";
myObject["q103"] = "Your school?";
console.log(Object.keys(myObject).length);

to define the myObject object.

Then we call Object.keys with myObject to return an array of non-inherited property key strings.

And then we get the length property of that to get the number of non-inherited properties in the object.

Conclusion

To get the length of a JavaScript associative array, we use the Object.keys method.

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