JavaScript shorthand ternary operator
var startingNumber = startingNumber || 1;Something like that what you're looking for, where it defaults if undefined?
var foo = bar || 1; // 1var bar = 2;foo = bar || 1; // 2By the way, this works for a lot of scenarios, including objects:
var foo = bar || {}; // secure an object is assigned when bar is absent
|| will return the first truthy value it encounters, and can therefore be used as a coalescing operator, similar to C#'s ??
startingNum = startingNum || 1;
Yes, there is:
var startingNum = startingNum || 1;In general, expr1 || expr2 works in the following way (as mentioned by the documentation):
Returns
expr1if it can be converted totrue; otherwise, returnsexpr2. Thus, when used withBooleanvalues,||returnstrueif either operand istrue; if both arefalse, returnsfalse.