Q151. What is the purpose of Doctype in HTML?
The Doctype declaration specifies the type of document being used and tell the web browser how to interpret the pages content. It is located at the top of the HTML docume...
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Q152. How do you compare Object and Map?
**Objects** and **Maps** both allow you to associate keys with values, retrieve those values, delete keys, and check if a key exists. Historically, Objects have been used...
Q153. What is state in React?
_State_ of a component is an object that holds some information that may change over the lifetime of the component. The important point is whenever the state object chang...
Q154. Why is audience targeting important in paid media?
Audience targeting decides who sees an ad, and it matters because showing the right message to the wrong people wastes money and damages relevance scores. It works on a f...
Q155. How do you keep your CRM data accurate and useful?
Accurate CRM data is what makes forecasting and handovers possible, so I treat updating it as part of the work, not as admin. After every call I log the key points within...
Q156. Explain the difference between correlation and causation.
Correlation means two variables move together; causation means one produces a change in the other. Correlation is symmetric and measurable with a coefficient, while causa...
Q157. How do you evaluate a regression model?
Choose metrics that match the problem. - MAE: mean absolute error, in the target's units, robust to outliers. - MSE and RMSE: penalize large errors more; RMSE is in targe...
Q158. What is semantic HTML?
Semantic HTML uses specific HTML elements to provide additional information about the structure and content of the page, making it more accessible and easy to read.
Q159. What is the difference between == and === operators?
JavaScript provides two types of equality operators: - **Loose equality (`==`, `!=`)**: Performs type conversion if the types differ, comparing values after converting th...
Q160. What are props in React?
_Props_ are inputs to components. They are single values or objects containing a set of values that are passed to components on creation similar to HTML-tag attributes. H...