最も有効な JS-Dev-101 試験参考書

01 function Monster() { this.name = 'hello'; };
02 const m = Monster();
What happens due to the missing new keyword?

• A. window.m is assigned the correct object.
• B. The m variable is assigned the correct object.
• C. window.name is assigned to 'hello' and the variable m remains undefined.
• D. The m variable is assigned the correct object but this.name remains undefined.

Refer to the code below:
let strNumber = '12345';
Which code snippet shows a correct way to convert this string to an integer?

• A. let numberValue = Number(strNumber);
• B. let numberValue = textValue.toInteger();
• C. let numberValue = (number) textValue;
• D. let numberValue = Integer(strNumber);

Given a value, which three options can a developer use to detect if the value is NaN?

• A. value === Number.NaN
• B. Number.isNaN(value)
• C. value == NaN
• D. value !== value
• E. Object.is(value, NaN)

A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client. The team wants a web server that runs on Node.js, and they want to use the new web framework Minimalist.js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?

• A. Next.js
• B. Angular
• C. Gatsby
• D. Next

Given the HTML below:
<div>
<div id="row-uc">Universal Containers</div>
<div id="row-as">Applied Shipping</div>
<div id="row-bt">Burlington Textiles</div>
</div>
Which statement adds the priority-account CSS class to the Applied Shipping row?

• A. document.querySelector('#row-as').classList.add('priority-account');
• B. document.getElementById('row-as').addClass('priority-account');
• C. document.querySelector('#row-as').classes.push('priority-account');
• D. document.querySelectorAll('#row-as').classList.add('priority-account');