Which variable name is not valid in JavaScript?

For example, break or boolean variable names are not valid. JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 123test is an invalid variable name but _123test is a valid one.

What happens if you misspell a variable name in JavaScript?

If you misspell the name of a variable that you’ve already declared, it will be treated as a new global variable. With this in mind, be sure to include the keyword when you declare new variables and always declare a variable before you refer to it in your code.

What are invalid variable names?

The following are examples of invalid variable names: age_ (ends with an underscore); 0st (starts with a digit); food+nonfood (contains character “+” which is not permitted)

Which of the following is not supported by JavaScript?

Which of the following is not JavaScript Data Types? Explanation: These are the JavaScript Data types: Number, String, Boolean, Object, Undefined.

Which of the following variable names are illegal and will cause the syntax error exception?

If you give a variable an illegal name, you get a syntax error when you try to execute the code. csp-10-2-1: Click the portion of the variable names that cause syntax errors. The variable name 76trombones is illegal because it begins with a number. The name [email protected] is illegal because it contains an illegal character, @.

Is misspelling a variable name a syntax error?

Let us start with the first error type, which is the syntax error. These errors mainly occur as a result of the misspelling of variable or function names or from missing quotes or parentheses (or the accidental extraneous typing of an additional one of these).

What are the rules for variable names?

Rules of naming variables

Name your variables based on the terms of the subject area, so that the variable name clearly describes its purpose.
Create variable names by deleting spaces that separate the words.
Do not begin variable names with an underscore.
Do not use variable names that consist of a single character.

Which of the following if any are valid names for variables?