Veltris Interview Questions, Process, and Tips

Q1. Difference between Let, Var, Const
Ans. 
Let, Var, and Const are JavaScript keywords used for declaring variables with different scoping rules and mutability.
• Var has function scope and can be redeclared and reassigned.

• Let has block scope and can be reassigned but not redeclared.

• Const has block scope and cannot be reassigned or redeclared.

• Use const for values that won't change, let for values that will, and var for legacy code or global variables.
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Q2. Life Cycle of React-Native
Ans. 
React Native has several life cycle methods that are called at different stages of the component's life.
• Mounting: constructor(), componentWillMount(), render(), componentDidMount()

• Updating: componentWillReceiveProps(), shouldComponentUpdate(), componentWillUpdate(), render(), componentDidUpdate()

• Unmounting: componentWillUnmount()

• Error Handling: componentDidCatch()
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Q1. How to upload the app to both stores
Ans. 
To upload the app to both stores, create separate builds for each platform and follow the submission guidelines of each store.
• Create separate builds for iOS and Android platforms

• Follow the submission guidelines of the App Store and Google Play Store

• Submit the builds to each store separately

• Ensure that the app meets the requirements of each store
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Q2. Local Storage in React-Native
Ans. 
Local storage in React Native allows data to be stored on the device for offline use.
• AsyncStorage is the built-in API for local storage in React Native

• Data is stored as key-value pairs

• Data can be retrieved and updated asynchronously

• Local storage can be used for caching data for offline use

• Example: AsyncStorage.setItem('key', 'value')

• Example: AsyncStorage.getItem('key')
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Asked about find the duplicates of a number

Q1. L1 vs L2 regularization
Ans. 
L1 regularization adds penalty equivalent to absolute value of coefficients, promoting sparsity. L2 regularization adds penalty equivalent to square of coefficients, promoting smaller weights.
• L1 regularization is also known as Lasso regularization.

• L2 regularization is also known as Ridge regularization.

• L1 regularization can lead to feature selection by setting some coefficients to zero.

• L2 regularization is more stable ...read more
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Q2. Ensemble techniques
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Q1. About testing process
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