How do we print a variable at the MongoDB command prompt?

To print a variable at the MongoDB command prompt, you can either reference the variable name directly or use the print() function. Both methods display the variable's value in the shell.

Syntax

// Declaring and initializing a variable
var variableName = value;

// Method 1: Direct variable reference
variableName;

// Method 2: Using print() function
print(variableName);

Example 1: Integer Variable

Declare and initialize an integer variable ?

var myIntegerValue = 20;

Print the variable using direct reference ?

myIntegerValue;

20

Print using the print() function ?

print(myIntegerValue);

20

Example 2: String Variable

Declare and initialize a string variable ?

var myStringValue = "Hello MongoDB!!!";

Print the variable using direct reference ?

myStringValue;

Hello MongoDB!!!

Print using the print() function ?

print(myStringValue);

Hello MongoDB!!!

Key Points

• Both methods produce identical output for simple data types.
• print() is more explicit and readable in scripts.
• Direct variable reference is quicker for interactive shell use.

Conclusion

MongoDB shell provides two simple ways to display variable values: direct reference and the print() function. Choose based on your preference and context.