Javascript Data

Data definition involves declaring a variable and assigning a value to it. The variable acts as a named container that holds the data. It allows you to refer to and manipulate the data throughout your program.

examples of data definition in JavaScript along with explanations :

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let age = 25;

In this example, the variable age is assigned the value 25, which represents a numeric data type.

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let name = "John Doe";

The variable name is assigned the string value "John Doe" , which represents textual data.

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let isActive = true;

The variable isActive is assigned the boolean value true, which represents a logical state.

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let value = null;

The variable value is assigned the value null, indicating the intentional absence of an object value.

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  let data;

The variable data is declared without an initial value, resulting in an undefined value.

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let person = {
  name: "John",
  age: 25,
  isActive: true
};

The variable person is assigned an object containing key-value pairs representing properties of a person.

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function sayHello() {
  console.log("Hello!");
}

The sayHello function represents a reusable block of code that outputs "Hello!" when called.

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let numbers = [1, 2, 3, 4, 5];
let fruits = ["apple", "banana", "orange"];

The variable numbers is assigned an array of numeric values, while fruits contains an array of string values.