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export default function filterInPlace<T>(a: T[], condition: (value: T, index: number, array: T[]) => boolean): T[] {
let i = 0, j = 0;
while (i < a.length) {
const val = a[i];
if (condition(val, i, a)) a[j++] = val;
i++;
}
a.length = j;
return a;
}