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JavaScript for Python Programmers

Control Flow Statements

Explore control flow statements to understand how JavaScript executes code conditionally and repetitively compared to Python. Learn differences in syntax such as curly braces versus indentation, how to use if and else constructs, and the distinct use of boolean and comparison operators across both languages. This lesson helps you write clearer programs by mastering conditional logic essential for effective coding.

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Control flow statements are programming constructs that let the execution of certain blocks of code be contingent upon or be repeated based on certain conditions. They enable programmers to set the order in which a program executes its instructions.

The if statement

In Python, the if block is a conditional statement that executes a set of codes only when a specified condition is true. In Python, indentation after a colon (:) defines the scope of the block.

Python 3.5
x = 10
# Check if x is greater than 0
if x > 0:
  print("x is positive")
else:
  print("x is negative")

In JavaScript, the if statement is similar to Python’s if statement. It is used to execute a block of code if a specified condition is true. Like Python, JavaScript’s if statement is ...