Salesforce JavaScript Developer Practice Exam

What is the value of the variable sum defined with eval?

1. 105

2. "105"

3. TypeError

4. "10*10+5"

The correct answer is: 105

When using `eval`, the code inside the string is executed as if it were actual JavaScript code. In this case, if the variable `sum` is defined using `eval` to evaluate the expression `"10*10+5"`, the expression is computed by the JavaScript engine. Here's the breakdown of the evaluation: 1. The string expression `"10*10+5"` is parsed. 2. The multiplication precedes addition according to operator precedence rules in JavaScript. 3. Therefore, `10 * 10` is evaluated first, resulting in `100`. 4. Then, `5` is added to `100`, yielding a final result of `105`. As a result, if the variable `sum` is assigned the value of this evaluated expression, its value will indeed be `105`, a number, not a string. This is why the chosen answer reflects the numeric value resulting from the evaluated expression correctly.