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About Unexpected string concatenation in JavaScript function. The function should add two numbers, but it concatenates a number and a string.
toUpperCase () – Converts the entire string to upper case. Note: The concat, match, replace, and search functions were added in JavaScript 1.2. All other functions are available in JavaScript 1.0.
JavaScript's loose type system can lead to unexpected behavior when adding numbers and strings. The '+' operator performs string concatenation when one operand is a string.
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