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Questions and Answers
What will be the result of the expression 3 + '4' in JavaScript?
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?
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?
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?
If you have the variable let a = 3; and you perform the operation a + '5';, what will be the output?
Which statement best describes the behavior of the + operator in JavaScript when combined with a string?
Which statement best describes the behavior of the + operator in JavaScript when combined with a string?
Flashcards
JavaScript + operator
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
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
String concatenation
Combining two or more strings together.
JavaScript + operator with strings
JavaScript + operator with strings
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Implicit type conversion
Implicit type conversion
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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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