- at<V, K, T, D>(arr: V, index: K, def?: D): In<V, K, D extends never ? T | void : T | D>
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Type Parameters
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V extends ArrayLike<any, V>
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K extends string | number | symbol
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T extends any
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D extends unknown
Parameters
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arr: V
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index: K
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def: D = ...
Returns In<V, K, D extends never ? T | void : T | D>
从arr获取index处的item，支持负数