Top "If-statement" questions

An "if" statement is a flow control structure in most programming languages that branches execution flow depending on a binary condition, generally evaluated at runtime.

Else clause on Python while statement

I've noticed the following code is legal in Python. My question is why? Is there a specific reason? n = 5 while …

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Nested ifelse statement

I'm still learning how to translate a SAS code into R and I get warnings. I need to understand where …

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Can dplyr package be used for conditional mutating?

Can the mutate be used when the mutation is conditional (depending on the values of certain column values)? This example …

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How to SUM parts of a column which have same text value in different column in the same row

I have a column with names and a column with numbers: FirstName Name Number John Smith 17 John Smith 26 Peter Smith 116 …

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Using if(isset($_POST['submit'])) to not display echo when script is open is not working

I have a little problem with my if(isset($_POST['submit'])) code. What I want is some echos and a …

php mysql post if-statement isset
Negate if condition in bash script

I'm new to bash and I'm stuck at trying to negate the following command: wget -q --tries=10 --timeout=20 --spider http://…

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How do I test if a variable does not equal either of two values?

I want to write an if/else statement that tests if the value of a text input does NOT equal …

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Angularjs if-then-else construction in expression

Can I somehow use if-then-else construction (ternary-operator) in angularjs expression, for example I have function $scope.isExists(item) that has …

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What is a None value?

I have been studying Python, and I read a chapter which describes the None value, but unfortunately this book isn't …

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Putting an if-elif-else statement on one line?

I have read the links below, but it doesn't address my question. Does Python have a ternary conditional operator? (the …

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