Does the sort method mutate the original array or not? How to perform a non-mutating sort?
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219
Frontend
6300
681
Implement a storage class following the Observer pattern: the class stores data, allows subscribing and unsubscribing callback functions, and notifies all current subscribers of data changes, passing them the new data.
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219
Why is a function in JavaScript considered an object, even though typeof returns "function" for it?
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216
What other array methods do you know besides reduce (sorting, filtering, mutating methods, etc.)?
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201
What happens in the browser after entering a URL in the address bar?
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187
Why did you decide to consider other offers? What is wrong at your current job, or what prompted you to look for a new place?
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182
What is the keyword satisfies in TypeScript? When and how is it used?
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181
What does the underscore in a class property name, such as _data, mean, and does it make the property private?
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180
If you hang an event listener on a parent div instead of the input itself, will the input's event handler still trigger (explain the event bubbling mechanism)?
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178
How do you copy an object (non-primitive type) so that changes in the copy do not affect the original?
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177
How was form validation implemented in your project?
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172
How does enum work in TypeScript — what happens to keys and values if values are not specified or explicitly set?
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167
Primitive types can call built-in methods, such as toString. Why is this possible?
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165
What will change in the results on all three lines if you turn the getName function into an arrow function?
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164
Given an object with a getName method. What will be printed to the console on lines 12, 13, and 14 with different calls to the function?
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163
Have you worked with the Zod library?
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162
Write types for a reduce function using generics (array type, callback with accumulator, current value, index, initial value).
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160
How does the void type differ from never in TypeScript?
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160
How long have you been working at the company? When was the last time new employees joined the team?
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156
How to assign an object so that it is not a reference transfer (how to copy an object — shallowly and deeply)?
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154