Web Reference: This JavaScript example demonstrates two important string concepts. First, it shows string concatenation, where two strings are combined to create a new string using the + operator. Oct 12, 2021 · Everything I'm reading about modifying strings in Javascript says that strings are immutable. Hence why concat returns a new string that is a modification of the original: Nov 4, 2025 · Exploring JavaScript string immutability, why operations create new strings, and benchmarking performance differences between direct concatenation and Array.join methods.
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