query: typeof undefined. Which is faster and better?
positive_passages.docid: 6288
positive_passages.text: How do I check if an object has a specific property in JavaScript?
negative_passages.docid: 19957
negative_passages.text: Is returning early from a function more elegant than an if statement?
negative_passages.docid: 125415
negative_passages.text: Why is undefined == undefined but NaN != NaN?
negative_passages.docid: 50187
negative_passages.text: Which "if" construct is faster - statement or ternary operator?
negative_passages.docid: 82116
negative_passages.text: Should I be using object literals or constructor functions?
negative_passages.docid: 144960
negative_passages.text: Why is Javascript's "in" operator consistently slower than strict member comparison to undefined?
negative_passages.docid: 6921
negative_passages.text: VB.Net variable declaration : type or not to type?
negative_passages.docid: 20681
negative_passages.text: Is there a better way to do optional function parameters in JavaScript?
negative_passages.docid: 149867
negative_passages.text: Why is `sort < "$f1" ` preferred over `sort -- "$f1"`, and why is this preferred over `sort "$f1"`?
negative_passages.docid: 27606
negative_passages.text: Detecting an undefined object property
negative_passages.docid: 49757
negative_passages.text: Is using double faster than float?
negative_passages.docid: 10259
negative_passages.text: Javascript: What's more efficient, IF block or TRY/CATCH?
negative_passages.docid: 134996
negative_passages.text: How can I temporarily disable the "return value might be undefined" warning?
negative_passages.docid: 29701
negative_passages.text: Why does instanceof return false for some literals?
negative_passages.docid: 104620
negative_passages.text: Array or List in Java. Which is faster?
negative_passages.docid: 107937
negative_passages.text: ?: Operator Vs. If Statement Performance
negative_passages.docid: 54646
negative_passages.text: How undefined is undefined behavior?