Free Salesforce JS-Dev-101 Exam Dumps June 2026

Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:

In JavaScript, there is only one numeric type for ordinary numbers: number.

JavaScript number is a double-precision 64-bit binary format (IEEE 754).

There is no separate float, double, or decimal type in core JavaScript.

So:

typeof pi === 'number';

Hence, the correct answer is:

A . Number

Options B, C, D are specific numeric types found in other languages (like C, Java, C#), not distinct types in JavaScript.

Study Guide Concepts:

JavaScript primitive types

typeof operator and number

Lack of separate float / double / decimal types in JS

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JSON.stringify(john) converts the john object into a JSON string.

When you JSON.parse that string back, you get a plain object:

Only data that can be represented in JSON is preserved (numbers, strings, booleans, arrays, plain objects).

Functions are not preserved and are dropped.

So dan is a plain object with properties firstName and lastName, but no name method.

Therefore, dan.name is undefined, and dan.name() throws:

TypeError: dan.name is not a function

The literal string interpolation inside console.log('Hello ${...}') is also wrong (single quotes), but the code never reaches that line.

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document.querySelector('#row-as') returns the single element with id row-as.

That element has a classList property with add, remove, etc.

Correct usage:

document.querySelector('#row-as').classList.add('priority-account');

Why others are wrong:

A: querySelectorAll returns a NodeList, not a single element, so it does not have a classList property.

C: DOM elements do not have a classes array or push; they have classList.

D: document.getElementById('row-as') is fine to get the element, but there is no addClass method in standard DOM; that's a jQuery-style API, not vanilla JS.

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