学ぶ Working with null in JavaScript | Variables and Data Types in JavaScript

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In JavaScript, the null type represents "nothing" or the absence of data. It is used to indicate that a variable intentionally lacks a value. The following example demonstrates that the null type produces no output in the console:


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let variable = null

console.log("Some data 1")
console.log(variable)
console.log("Some data 2")

The example above demonstrates that the null type produces no output in the console.

Note

null is distinct from undefined;

We use null when we need to signify the absence of data or to pass the concept of "nothing" to another part of the program.

For instance, imagine you're working on a game where you need to describe a hero's data. In some cases, the hero's name might be unknown or missing. If the variable containing the hero's name doesn't exist, attempting to access it would result in an error. Using the null type allows you to indicate that the hero has no name and can be passed to another part of the program.

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セクション 2. 章 5