ternary-operator

Anyone have a good trick to remember the standard ternary syntax? Specifically whether the '?' or ':' comes first. I have consistently gotten this backwards over the years. The condition you are checking is kind of like a question, so the question mark comes first. x > 0 ? 1 : 0 Think of this statement as three English sentences: "Is x greater than 0? Then 1. Else, 0." You have one sentence for each clause in the statement. The predicate: x > 0 ? /* Is x greater than 0? */ The "true" branch: 1 /* Then 1. */ The "false" branch: : 0 /* Else, 0. */ As far as remembering which symbol comes first,

I gone through this question - why the result of : 1 ? (int *)0 : (void *)0 differs to the result of : 1 ? (int *)0 : (void *)1 How it is differ ? It should be 0 or (int*)0 . How to check the result ? Where we can use such type of expression ? effeffe The only difference is in types: the first one returns an int * , the second one returns a void * . From C11 standard, §6.5.15 Conditional operator , ¶6: If both the second and third operands are pointers or one is a null pointer constant and the other is a pointer, the result type is a pointer to a type qualified with all the type qualifiers of

Here I am trying to change the value of the following check box while clicking on it. In the code below I tried to change the value of the checkbox to 1 and change the value to 0 when unchecked. But it takes only the false condition, when the checkbox is unchecked the value changes to 0 but when checked its not changing to 1. Any suggestions how to fix this out ? <input type="checkbox" id="read" name="permission[]" onClick="($(this).checked)?$(this).attr('value',1):$(this).attr('value',0)"/> I don't really understand why you would want to do this (the checkbox's value won't be submitted

Fails: object o = ((1==2) ? 1 : "test"); Succeeds: object o; if (1 == 2) { o = 1; } else { o = "test"; } The error in the first statement is: Type of conditional expression cannot be determined because there is no implicit conversion between 'int' and 'string'. Why does there need to be though, I'm assigning those values to a variable of type object. Edit: The example above is trivial, yes, but there are examples where this would be quite helpful: int? subscriptionID; // comes in as a parameter EntityParameter p1 = new EntityParameter("SubscriptionID", DbType.Int32) { Value = ((subscriptionID

New to javascript and I'm having trouble counting the number of trues in an array of boolean values. I'm trying to use the reduce() function. Can someone tell me what I'm doing wrong? //trying to count the number of true in an array myCount = [false,false,true,false,true].reduce(function(a,b){ return b?a++:a; },0); alert("myCount ="+ myCount); // this is always 0 Seems like your problem is solved already, but there are plenty of easier methods to do it. Array.prototype.filter() - the easiest one, in my opinion. console.log([true,false,true,false,true].filter(v => v).length); or even simplier:

I went looking through Raphael.js 's source code to find out how he converted RGB values to HSB. I found out the function he did it in and I was in the process of converting it to Python when I bumped into this nice triple-nested ternary operator: H = (C == 0 ? null : V == r ? (g - b) / C : V == g ? (b - r) / C + 2 : (r - g) / C + 4 ); It threw me for a loop because Python doesn't have the same kind of ternary operator that Javascript does. I spent a while looking over it and eventually hashed this somewhat saner code (using only if/else) out of it: if (C == 0) { H = null; } else { if(V == r)