Frontend Developer Interview Questions

8,954 frontend developer interview questions shared by candidates

The Assignment they gave me: Create a dashboard with the following features Create filter/aggregation configuration over the sample data to create different datasets Create widgets/charts with the configured datasets Poll data from the sample data at 100 rows every 10 seconds The configuration for these datasets and charts should be editable by the user. Base dashboard widgets : The hourly average temperature of the area Temperature average per device_display_name Pseudo live stream of temperature with the filter of device_display_name ( use the data polling feature here ) Tech specification: Develop this application using ReactJS. Charting libraries can be echarts,bizcharts, plotly,etc. You can use lodash, lambdaJS, antd/dataset to wrangle/filter/aggregate data. Bonus- Host your application on Heroku or any other hosting platform Time limit: 2 days
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Frontend Developer

Interviewed at Zenatix

3.9
Nov 30, 2020

The Assignment they gave me: Create a dashboard with the following features Create filter/aggregation configuration over the sample data to create different datasets Create widgets/charts with the configured datasets Poll data from the sample data at 100 rows every 10 seconds The configuration for these datasets and charts should be editable by the user. Base dashboard widgets : The hourly average temperature of the area Temperature average per device_display_name Pseudo live stream of temperature with the filter of device_display_name ( use the data polling feature here ) Tech specification: Develop this application using ReactJS. Charting libraries can be echarts,bizcharts, plotly,etc. You can use lodash, lambdaJS, antd/dataset to wrangle/filter/aggregate data. Bonus- Host your application on Heroku or any other hosting platform Time limit: 2 days

1. Convert String to number. 2. Get integer and decimal part of string. 3. What’s an alternate way to convert string to number besides Number() and get the integer part only? 4. How does parseInt() work internally? 5. What are the arguments it takes?
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SDE-2 Frontend Developer

Interviewed at Newton School

3.8
Jul 30, 2025

1. Convert String to number. 2. Get integer and decimal part of string. 3. What’s an alternate way to convert string to number besides Number() and get the integer part only? 4. How does parseInt() work internally? 5. What are the arguments it takes?

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