Web Reference: The answer is that in JavaScript, arrays and objects are mutable, while strings and numbers and other primitives are immutable. When we do an assignment like: var myArray = ['a', 'b', 'c']; var copyOfMyArray = myArray; copyOfMyArray is really just a reference to myArray, not an actual copy. Jan 16, 2026 · In this blog, we’ll demystify why changing one array affects another, break down the underlying memory mechanics, and provide practical solutions to avoid this problem. Jan 17, 2026 · Understanding why arrays change when passed to methods boils down to Java’s pass-by-value rule and the distinction between primitive and reference types. Arrays are reference types, so passing them to a method copies their reference—allowing the method to modify the original array’s elements.
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