I am debugging some JavaScript and can’t explain what this || does: function (title, msg) { var title = title || ‘Error’; var msg = msg || ‘Error on Request’; } Why is this guy using var title = title || ‘ERROR’? I sometimes see it without a var declaration as well. 12 Answers 12
According to the R language definition, the difference between & and && (correspondingly | and ||) is that the former is vectorized while the latter is not. According to the help text, I read the difference akin to the difference between an “And” and “AndAlso” (correspondingly “Or” and “OrElse”)… Meaning: That not all evaluations if … Read more
Given this snippet of JavaScript… var a; var b = null; var c = undefined; var d = 4; var e=”five”; var f = a || b || c || d || e; alert(f); // 4 Can someone please explain to me what this technique is called (my best guess is in the title of … Read more
