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Author: Andy

How to check whether a string contains a substring in JavaScript?

In JavaScript, there are several ways to check if a string contains a substring. Here are … How to check whether a string contains a substring in JavaScript?Read more

by Andy|April 25, 2025April 25, 2025|JavaScript, substring

How do closures work in JavaScript?

In JavaScript, closures are a powerful and fundamental concept that allows functions to “remember” and access … How do closures work in JavaScript?Read more

by Andy|April 25, 2025April 25, 2025|closure, JavaScript

How to remove a property from a JavaScript object?

To remove a property from a JavaScript object, you can use the delete operator or create … How to remove a property from a JavaScript object?Read more

by Andy|April 25, 2025April 25, 2025|JavaScript, property, remove

How to use extern to share variables between source files in C/C++?

To share variables between source files in C/C++ using the extern keyword, follow these steps: Step-by-Step … How to use extern to share variables between source files in C/C++?Read more

by Andy|April 19, 2025April 26, 2025|C, C++, extern, variable

How to filter Pandas dataframe using ‘in’ and ‘not in’ like in SQL?

To filter a pandas DataFrame using “IN” and “NOT IN” logic (similar to SQL), you can … How to filter Pandas dataframe using ‘in’ and ‘not in’ like in SQL?Read more

by Andy|April 19, 2025April 25, 2025|DataFrame, filter, Pandas

How to create a new column where the values are selected based on an existing column?

To create a new column in a pandas DataFrame where values are conditionally derived from an … How to create a new column where the values are selected based on an existing column?Read more

by Andy|April 19, 2025April 25, 2025|column, Pandas

How to pivot a dataframe in pandas ?

To pivot a DataFrame in pandas, you can use the pivot(), pivot_table(), stack(), unstack(), or melt() … How to pivot a dataframe in pandas ?Read more

by Andy|April 19, 2025April 25, 2025|Pandas, pivot

What are metaclasses in Python?

In Python, metaclasses are classes that create other classes. They act as blueprints for class creation, … What are metaclasses in Python?Read more

by Andy|April 19, 2025April 25, 2025|metaclass, Python

What does “use strict” do in JavaScript?

The “use strict” directive in JavaScript enables strict mode, a stricter variant of JavaScript introduced in … What does “use strict” do in JavaScript?Read more

by Andy|April 19, 2025April 25, 2025|JavaScript, strict

Is there a ternary conditional operator in Python?

Yes, Python has a ternary conditional operator (often called a “ternary expression”) that allows you to … Is there a ternary conditional operator in Python?Read more

by Andy|April 19, 2025April 25, 2025|operator, Python

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