How to Determine if a Variable Holds a Function in Programming?

Determining the Function Type of a Variable

Often, variables in programming languages hold various data types, including functions. To ascertain the type of a variable, several methods are available. This article will delve into a specific method for determining if a variable is of function type.

A function type refers to a variable that encapsulates a block of executable code. To check if a variable is of function type, the following approach can be employed:

<code class="javascript">function foo(v) {
  if (typeof v === 'function') {
    // Perform intended actions
  }
}</code>

In this function, the typeof operator is used to inspect the type of the variable. If the result of typeof v is 'function', it signifies that the variable v holds a function-like object. Subsequently, the conditional branch within the function body can be executed to perform the desired operations.

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