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JavaScript String Concatenation

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Questions and Answers

What will be the result of the expression 3 + '4' in JavaScript?

undefined
34 (correct)
7
error

How does JavaScript handle the + operator when one operand is a string?

It ignores the string operand.
It throws a type error.
It performs addition on numeric values only.
It concatenates strings after converting numeric operands to strings. (correct)

What happens to the number when used with the + operator and a string in JavaScript?

It is discarded.
It is coerced to a string before concatenation. (correct)
It is added to the string numerically.
It remains a number and causes an error.

If you have the variable `let a = 3;` and you perform the operation `a + '5';`, what will be the output?

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Which statement best describes the behavior of the + operator in JavaScript when combined with a string?

<p>It always performs string concatenation if one operand is a string. (A)</p>

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Flashcards

JavaScript + operator

In JavaScript, the + operator behaves differently when dealing with a number and a string. It converts the number into a string before concatenating the two values.

Type coercion in JavaScript

JavaScript automatically converts the type of a value to match the type of the other value in an expression when necessary.

String concatenation

Combining two or more strings together.

JavaScript + operator with strings

When one operand is a string, JavaScript implicitly converts the other operand to a string and then concatenates the operands.

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Implicit type conversion

JavaScript automatically converts a value to a different type without explicit instructions.

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Study Notes