Hackharbor 3.0 Day 4:Tech

Which statement below accurately describes JavaScriptʼs typing system?

• JavaScript requires explicit data type declaration for every variable

• JavaScript is statically typed like C

• JavaScript is dynamically typed and infers the data type at runtime

• JavaScript cannot change a variableʼs type once assigned

Whatʼs the difference between null and undefined in JavaScript?

• Both mean the same: variable has no value

• null means variable is declared but empty, undefined means variable does not exist

• undefined means variable is declared but not assigned; null is an assigned “empty” value

• None, they are interchangeable

What will happen if you omit semicolons at the end of statements in JavaScript?

• JavaScript inserts them automatically in most cases

• The script will never run

• It causes syntax errors every time

• The browser ignores the whole script

Which one of these is the recommended way to attach multiple event listeners to the same button?

• Use multiple onclick attributes on button element

• Use inline onclick plus .addEventListener()

• Use .addEventListener() multiple times on the button element

• Overwrite the buttonʼs .onclick property multiple times

Why did JavaScript go to therapy?

• Because it had too many types of issues: null, undefined, and mixed feelings about == vs ===!

• To learn Python

• Because it couldnʼt decide if it wanted to be static or dynamic

• It wanted a break from browsers

If you place a