Salesforce JS-Dev-101 Exam - Topic 4 Question 3 Discussion

Comprehensive and Detailed Explanation From JavaScript Knowledge:

We want to convert the number 1982 to a string.

Check each option:

A . numValue.toText()

There is no standard toText() method on numbers.

This will result in TypeError: numValue.toText is not a function.

B . String(numValue);

String() as a function converts its argument to a string.

String(1982) returns '1982'.

This is correct.

C . '' + numValue;

'' is a string; + with a string operand performs string concatenation.

'' + 1982 '1982'.

This is a common shorthand for number-to-string conversion.

D . numValue.toString();

Number.prototype.toString() converts the number to its string representation.

1982..toString() or (1982).toString() returns '1982'.

For the variable, numValue.toString() is valid: '1982'.

E . (String)numValue;

This is not valid JavaScript casting syntax; it is more like a C/Java-style cast.

In JavaScript, that is parsed as a grouping expression (String) and then numValue; it does not convert numValue to a string.

Thus the correct answers are:

B . String(numValue);

C . '' + numValue;

D . numValue.toString();

Relevant concepts: primitive type conversion, String() casting, .toString(), coercion via + with strings.

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