Podcast
Questions and Answers
Which of the following is NOT a valid way to declare a variable in JavaScript?
Which of the following is NOT a valid way to declare a variable in JavaScript?
Which option correctly declares a string variable in JavaScript?
Which option correctly declares a string variable in JavaScript?
Which variable name is not valid in JavaScript?
Which variable name is not valid in JavaScript?
Which of the following correctly initializes a boolean variable in JavaScript?
Which of the following correctly initializes a boolean variable in JavaScript?
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Which syntax error would occur when declaring a variable using the keyword 'var'?
Which syntax error would occur when declaring a variable using the keyword 'var'?
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ما هي الطريقة الصحيحة لاستخدام عامل الربط لدمج سلسلتين نصيتين في JavaScript؟
ما هي الطريقة الصحيحة لاستخدام عامل الربط لدمج سلسلتين نصيتين في JavaScript؟
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ما هو بناء جملة عبارة if-else في JavaScript؟
ما هو بناء جملة عبارة if-else في JavaScript؟
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ما هي الوحدة التي ليست وحدة قياس صالحة في CSS؟
ما هي الوحدة التي ليست وحدة قياس صالحة في CSS؟
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ما هو التأشير الصحيح لأهم عنوان في HTML؟
ما هو التأشير الصحيح لأهم عنوان في HTML؟
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هل يمكن للمستخدمين تعيين تفضيلات المتصفح الخاصة بهم؟
هل يمكن للمستخدمين تعيين تفضيلات المتصفح الخاصة بهم؟
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Study Notes
Declaring Variables in JavaScript
- Variable
y
can be declared with the keywordvar
and assigned a string value, such as"hello"
. - Variable
x
can be declared with the keywordvar
and assigned a numeric value, such as5
. - Identifier
1z
is not a valid variable name in JavaScript, as it starts with a number. - There is no such keyword as
Ovar
in JavaScript to declare a variable, soD-Ovar a
is an invalid declaration.
JavaScript Variables
-
var 1z = true
is not a valid way to declare a variable in JavaScript. - Valid variable declarations include
var y = "hello"
andvar x = 5
.
JavaScript String Concatenation
- The correct way to use the concatenation operator to combine two strings is
"Hello " + "world"
.
JavaScript If-Else Statements
- The syntax for an if-else statement is
if (condition) { code block } else { code block }
.
CSS Units of Measurement
-
lb
is not a valid unit of measurement in CSS. - Valid units of measurement in CSS include
cm
,px
,em
, and others.
Browser Preferences
- Users can set their own browser preferences, making
True
the correct answer.
HTML Headings
- The most important heading should be marked up as
h1
. - Headings in HTML should follow a hierarchical structure, with
h1
being the most important andh6
being the least important.
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Description
This quiz tests your understanding of how to declare variables in JavaScript. Identify the invalid way to declare a variable in JavaScript.