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Which keyword is used to declare variables in JavaScript?
- a)var
- b)int
- c)const
- d)let
Correct answer is option 'A'. Can you explain this answer?
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Which keyword is used to declare variables in JavaScript?a)varb)intc)c...
The "var" keyword is used to declare variables in JavaScript.
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Which keyword is used to declare variables in JavaScript?a)varb)intc)c...
Declaring Variables in JavaScript using 'var'
Variables in JavaScript are declared using the keyword 'var'. This keyword is used to create a new variable and optionally initialize it with a value. Here is how you can declare a variable using 'var':
```javascript
var myVariable;
```
Differences between 'var' and other keywords
- int: 'int' is not a valid keyword for declaring variables in JavaScript. It is used in languages like Java and C++.
- const: 'const' is used to declare constants in JavaScript. Once a constant is declared and initialized, its value cannot be changed.
- let: 'let' is another keyword used to declare variables in JavaScript. It has block scope, meaning it is only accessible within the block it is declared in.
Example of declaring variables using 'var'
```javascript
var myNumber = 10;
var myString = 'Hello, World!';
```
Scope of variables declared with 'var'
Variables declared using 'var' have function scope. This means they are accessible within the function in which they are declared. If a variable is declared outside of a function using 'var', it becomes a global variable.
In conclusion, 'var' is the keyword used to declare variables in JavaScript, and it is important to understand its scope and usage when writing JavaScript code.
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Which keyword is used to declare variables in JavaScript?a)varb)intc)constd)letCorrect answer is option 'A'. Can you explain this answer?
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