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/*--- description: Array reduceRight and at esid: sec-properties-of-the-array-prototype-object ---*/ assert.sameValue(["a", "b", "c"].reduceRight(function (acc, x) { return acc + x; }), "cba"); assert.sameValue([10, 20, 30].at(-1), 30); assert.sameValue([10, 20, 30].at(0), 10);