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

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

• A. 105
• B. "105"
• C. TypeError
• D. "10*10+5"

Answer: (A)

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.

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.