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Ahooks source code interpretation series - 7
2021-08-27 10:31:22 【Front end shift student】
This series will ahooks Everything in it hook The source code is interpreted , By reading ahooks To get familiar with custom hook Writing , Improve your ability to write custom hook The ability of , I hope it can help you .
To distinguish from the original comments of the code , The personal understanding part uses ///
start , Here and Three slashes command It doesn't matter. , Just to distinguish .
Looking back
- ahooks Source code interpretation series
- ahooks Source code interpretation series - 2
- ahooks Source code interpretation series - 3
- ahooks Source code interpretation series - 4
- ahooks Source code interpretation series - 5
- ahooks Source code interpretation series - 6
What's Monday for ? Of course, a refreshing article first ahooks Source code interpretation ~ Enter today SideEffect Part of the ahooks.
SideEffect
useDebounceFn
Yes lodash.debounce Encapsulation
import debounce from 'lodash.debounce';
import { useRef } from 'react';
import useCreation from '../useCreation';
import { DebounceOptions } from '../useDebounce/debounceOptions';
import useUnmount from '../useUnmount';
type Fn = (...args: any) => any;
function useDebounceFn<T extends Fn>(fn: T, options?: DebounceOptions) {
const fnRef = useRef<T>(fn);
fnRef.current = fn;
const wait = options?.wait ?? 1000;
/// Change the target method to debounce edition
const debounced = useCreation(
() =>
debounce<T>(
((...args: any[]) => {
return fnRef.current(...args);
}) as T,
wait,
options,
),
[],
);
useUnmount(() => {
debounced.cancel();
});
return {
run: (debounced as unknown) as T,
cancel: debounced.cancel,
flush: debounced.flush,
};
}
export default useDebounceFn;
Copy code
useDebounce
Convert normal values to values with anti shake behavior
import { useState, useEffect } from 'react';
import useDebounceFn from '../useDebounceFn';
import { DebounceOptions } from './debounceOptions';
function useDebounce<T>(value: T, options?: DebounceOptions) {
const [debounced, setDebounced] = useState(value);
/// Change the method of updating the status to the anti shake method
const { run } = useDebounceFn(() => {
setDebounced(value);
}, options);
useEffect(() => {
run();
}, [value]);
return debounced;
}
export default useDebounce;
Copy code
useThrottleFn
Yes lodash.throttle Encapsulation
import throttle from 'lodash.throttle';
import { useRef } from 'react';
import useCreation from '../useCreation';
import { ThrottleOptions } from '../useThrottle/throttleOptions';
import useUnmount from '../useUnmount';
type Fn = (...args: any) => any;
function useThrottleFn<T extends Fn>(fn: T, options?: ThrottleOptions) {
const fnRef = useRef<T>(fn);
fnRef.current = fn;
const wait = options?.wait ?? 1000;
/// Convert the target method to a throttling version
const throttled = useCreation(
() =>
throttle<T>(
((...args: any[]) => {
return fnRef.current(...args);
}) as T,
wait,
options,
),
[],
);
useUnmount(() => {
throttled.cancel();
});
return {
run: (throttled as unknown) as T,
cancel: throttled.cancel,
flush: throttled.flush,
};
}
export default useThrottleFn;
Copy code
useThrottle
Convert normal values to values with throttling behavior
import { useState, useEffect } from 'react';
import useThrottleFn from '../useThrottleFn';
import { ThrottleOptions } from './throttleOptions';
function useThrottle<T>(value: T, options?: ThrottleOptions) {
const [throttled, setThrottled] = useState(value);
/// Throttling the method of updating values
const { run } = useThrottleFn(() => {
setThrottled(value);
}, options);
useEffect(() => {
run();
}, [value]);
return throttled;
}
export default useThrottle;
Copy code
useInterval、useTimeout
“ A timer that will wipe your ass ”
import { useEffect, useRef } from 'react';
function useInterval( fn: () => void, delay: number | null | undefined, options?: { immediate?: boolean; }, ): void {
const immediate = options?.immediate;
const fnRef = useRef<() => void>();
fnRef.current = fn;
useEffect(() => {
if (delay === undefined || delay === null) return;
if (immediate) {
fnRef.current?.();
}
const timer = setInterval(() => {
fnRef.current?.();
}, delay);
return () => {
/// Don't worry about forgetting to clear the timer anymore
clearInterval(timer);
};
}, [delay]);
}
export default useInterval;
Copy code
import { useEffect } from 'react';
import usePersistFn from '../usePersistFn';
function useTimeout(fn: () => void, delay: number | null | undefined): void {
const timerFn = usePersistFn(fn);
useEffect(() => {
if (delay === undefined || delay === null) return;
const timer = setTimeout(() => {
timerFn();
}, delay);
return () => {
/// Don't worry about forgetting to clear the timer anymore
clearTimeout(timer);
};
}, [delay, timerFn]);
}
export default useTimeout;
Copy code
The above contents are inevitably wrong due to my level , Welcome to discuss and feedback .
copyright notice
author[Front end shift student],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2021/08/20210827103118570P.html
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