a = (a == b) ? c: b;
I don't understand. All of them {a, b, c} are variables set with certain value by the programmer.
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If **a** is equals to **b** then assigns **c** to **a** else **b**. – Gaston Flores Jun 27 '13 at 16:39
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There's the same operator in other languages, but one thing to keep in mind with javascript, the conditional part of the ternary operator (the `(a == b)` in this example), is "truthy", not just simple booleans. So `99 ? "a" : "b"` will return "a", and `0 ? "a" : "b"` will return "b". This can let you do some cool stuff with this operator in javascript (just like you can with the `||` operator). – Joe Enos Jun 27 '13 at 16:41
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if a is equal to be then a equals c , else a equals b . – Pbk1303 Jun 27 '13 at 16:41
7 Answers
4
That is called the ternary operator: that is the same as doing:
if(a == b)
a = c;
else
a = b;
saamorim
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This is a short form for an if and an assignment.
q = x ? y : z
q is the variable you assign to x is a boolean expression which will be true or false. If it is true y will be assigned to your variable q else z will be assigned to q.
Thor
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This is the ternary operator, which is equivalent to:
if (a == b) {
a = c;
} else {
a = b;
}
The main difference is that if/else consists of conditional statements, while the ternary operator is a conditional expression. In other words, the ternary operator works as if the if/else were returning a value. In some other languages, if/else are expressions as well, so the following would be valid, and indeed equivalent to ?: :
a = (if (a == b) { c; } else { b; }) // not valid javascript
Be sure to check https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator
The Mozilla Developer Network is a fantastic reference for JavaScript.
Bruno Reis
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The ?: syntax is a ternary operator. Essentially it means that if a is equal to b than a equals c otherwise a equals b
Robert H
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