rc-js-util
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A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.
24 lines • 870 B
JavaScript
import { _Debug } from "../../debug/_debug.js";
/**
* @public
* Make an array contain the same items as another.
* @param from - The array to copy from.
* @param to - The array to copy into and resize.
* @param startIndex - The index to start with in the from array.
* @param length - The index to end with in the from array.
*
* @remarks
* See {@link arrayCopyInto}.
*/
export function arrayCopyInto(from, to, startIndex = 0, length = from.length) {
const end = startIndex + length;
to.length = length;
_BUILD.DEBUG && _Debug.runBlock(() => {
_Debug.assert(startIndex >= 0, "negative indexes are not supported");
_Debug.assert(end <= from.length, "length would overflow array");
});
for (let i = 0; startIndex < end; ++startIndex, ++i) {
to[i] = from[startIndex];
}
}
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