I've found this string in JavaScript code.
var c = (a.b !== null) ? a.b : null;
This is a shorthand of an if-else statement, however the value null is assigned if it is null. Isn't that ALWAYS equivalent to
var c = a.b
including all cases - exceptions, null, undefined, etc?
In another words, are these lines (always) equivalent?
var c = (a.b !== null) ? a.b : null;
-vs-
var c = a.b
No, they AREN'T NECESSARILY EQUAL always if b is a getter that updates a variable. It's bad practice to code this way though
var log = 0;
var a = {
get b() {
log++;
return log;
}
}
var c = (a.b !== null) ? a.b : null;
// outputs 2
console.log(c);
var log = 0;
var a = {
get b() {
log++;
return log;
}
}
var c = a.b;
// outputs 1
console.log(c);
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