Diffusion Ant (master) Code

ant/tests/test_array_sparse_descending_length.cjs
e35c3ed2ab40master

test_array_sparse_descending_length.cjs
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			const assert = require("node:assert");

			const arr = [];
			for (let n = 128, i = 0; i < 111; i++) {
			arr[--n] = i;
			}

			assert.equal(arr.length, 128);
			assert.equal(arr[127], 0);
			assert.equal(arr[31], 96);
			assert.equal(arr[30], 97);
			assert.equal(arr[17], 110);
			assert.equal(arr[16], undefined);
			assert.equal(Object.keys(arr).length, 111);

			const mixed = [];
			mixed[127] = "tail";
			mixed[31] = "lower";

			assert.equal(mixed.length, 128);
			assert.equal(mixed[127], "tail");
			assert.equal(mixed[31], "lower");

			console.log("OK: sparse descending array writes preserve length");

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