JavaScript call() Method

The call() method in JavaScript allows you to invoke a function with a specified this value and arguments passed individually. It is part of the Function prototype, so all functions can access it. This method is useful for borrowing functions from other objects.

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Syntax

• functionName: The function to invoke.
• thisArg: The value to use as this inside the function.
• arg1, arg2, ...: Arguments passed to the function.

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Example 1: Using call() to Set this

Explanation:

• Inside fullName, this refers to user, not person.
• The method is borrowed using call().

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Example 2: Passing Arguments

Explanation:

• greet is called with this set to user.
• Arguments "Hello" and "!" are passed individually.

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Difference Between call() and apply()

• call() passes arguments one by one.
• apply() passes arguments as an array.

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Example 3: Reusing a Function

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Key Takeaways

• call() invokes a function with a specified this value.
• Useful to borrow methods from one object for another.
• Arguments are passed individually.
• call() is related to apply() and bind() methods.