Title: Theory / Unimportant / CS / Softw / Website / Google / Sheets / Info
On every note of this deck, unless a note says otherwise:
Page: https://support.google.com/docs/table/25273?hl=en

Instruction: ERROR.TYPE(reference)
Language: Sheets
Context: Info
Returns: Returns a number corresponding to the error value in a different cell. Learn more

Instruction: ISBLANK(value)
Language: Sheets
Context: Info
Returns: Checks whether the referenced cell is empty. Learn more

Instruction: ISDATE(value)
Language: Sheets
Context: Info
Returns: Returns whether a value is a date. Learn more.

Instruction: ISEMAIL(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is a valid email address. Learn more

Instruction: ISERR(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is an error other than `#N/A`. Learn more

Instruction: ISERROR(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is an error. Learn more

Instruction: ISFORMULA(cell)
Language: Sheets
Context: Info
Returns: Checks whether a formula is in the referenced cell. Learn more

Instruction: ISLOGICAL(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is `TRUE` or `FALSE`. Learn more

Instruction: ISNA(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is the error `#N/A`. Learn more

Instruction: ISNONTEXT(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is non-textual. Learn more

Instruction: ISNUMBER(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is a number. Learn more

Instruction: ISREF(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is a valid cell reference. Learn more

Instruction: ISTEXT(value)
Language: Sheets
Context: Info
Returns: Checks whether a value is text. Learn more

Instruction: N(value)
Language: Sheets
Context: Info
Returns: Returns the argument provided as a number. Learn more

Instruction: NA()
Language: Sheets
Context: Info
Returns: Returns the "value not available" error, `#N/A`. Learn more

Instruction: TYPE(value)
Language: Sheets
Context: Info
Returns: Returns a number associated with the type of data passed into the function. Learn more

Instruction: CELL(info_type, reference)
Language: Sheets
Context: Info
Returns: Returns the requested information about the specified cell. Learn more