Frontend

Implement a simple slot machine "one-armed bandit": - Implement three reels (with digits from 0 to 9, changing sequentially 0,1,2,...9,0,1,2...) - Each onRoll on the reel yields the next value - If all three digits match after stopping - we say that the player wins - Disable the button during spinning The physical model of the wheel is already implemented in the runSpinner method, but it doesn't mean anything about the digits. Tip: start implementation with the first reel, then add the others similarly.

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What will 'this' be inside a function if called with 'call' without passing a context - in strict mode and without?

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Tell me how the Event Emitter pattern works and if you have encountered it, particularly in Angular.

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Is Observable synchronous or asynchronous?

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Why is the victory counted incorrectly even if the values on the drums are different? Understand the cause of the bug related to asynchronous state update (state race condition).

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What problems does dependency injection solve in Angular and what are the advantages of providing services at the application and component levels?

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Given three new types. You need to create a new generic type that will contain all the fields of these types (using union).

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Explain the difference between cold and hot Observables.

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Break down the application according to the Feature-Sliced Design (FSD) architecture — describe the layers App, Pages, Widgets, Features, Entities.

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Try to mock a situation where all three numbers on the reels match, and check that a victory message is displayed.

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React task (3 sub-tasks): 1) Fix the user edit form — clicking on a username in the list should populate the input form with that name. 2) The edit form should not re-render when typing in the search field (optimization with React.memo). 3) When selecting a user from the list, the search field should reset.

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The function simulates the rotation of a drum with a gradual stop - use onRoll for the rotation animation (changing the current value on the drum) - and onStop to notify when the drum has finished spinning example runSpinner( () => setValue(v => ++v % 10), () => console.log('finished') )

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You are given an array a, consisting of n positive integers. Are there three distinct indices i, j, k such that the sum a[i]+a[j]+a[k] ends with the digit m? For example, for m = 3 solve([20, 22, 19, 84]) => true // 20 + 84 + 19 = 123 solve([1,2,3]) => false

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What is the Awaited utility type in TypeScript?

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What is the difference between ChangeDetectorRef.markForCheck() and detectChanges()?

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What will change in the type logic if you replace 'extends' with '=' (set a default value for the generic)?

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Fix the code so that clicking the button rerenders only App, and entering text in input — only Parent (without unnecessary rerenders of Child).

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Are you familiar with Web Vitals metrics? How can CLS (Cumulative Layout Shift) be improved?

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Regarding databases — why did you choose IndexedDB for local storage instead of something else? What are the alternatives?

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What will change in the type logic if you replace `extends` with `=` (set a default value for the generic)?

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