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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)

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?

<p>15 (D)</p> Signup and view all the answers

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> Signup and view all the answers

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

JavaScript String Concatenation with the + Operator

The + operator in JavaScript behaves differently when one operand is a number and the other is a string.
When one operand is a string, the other operand is implicitly converted to a string.
JavaScript performs type coercion to convert the number to a string.
Then, the two string values are concatenated.

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Description

This quiz explores the behavior of the + operator in JavaScript for string concatenation. It highlights how type coercion occurs when combining numbers and strings, resulting in the conversion of numbers to strings. Test your understanding of these concepts!