match

问题 I want to switch through many possible cases for x and there's one case (here x == 0 ) where I want to check the result of some additional code to determine what to do next. One possibility is to return early from the match. I'd use break to do this early-returning in C, but this isn't allowed in Rust. return returns from the parent function (in this case main() ) and not from the match only (i.e. the println! at the end isn't run!). I could just negate the sub-condition (here y == 0 ) and

问题 I faced a problem with comparing data in excel. I asked a similar question earlier (Is there any Excel Formula for comparing 2 columns for containing data and counting their occurrence?), but my problem still not solved. So please help me, someone. I will show an example of what do I want to get: As you can see by these screenshots formula returns me "1" value only if it is an exact match, but I need an approximate match. So for example, if I need "Apple" and I have "Apple Inc" formula must

问题 I'm trying to pack columnar data so that it can be sent to a server. I wanted to be able to pass any suitable vector to the sending function, so I did this (brief version): enum Column { Short(Vec<i16>), Int(Vec<i32>), } impl Column { fn as_bytes(&mut self) -> &[u8] { use Column::*; // weird match self { Short(vec) => unsafe { (vec.align_to::<u8>()).1 }, //why the ::? Int(vec) => unsafe { (vec.align_to::<u8>()).1 }, } } } This works ok. However, if I rewrite the match with an or pipe: impl

问题 I have below types documents. { "_index": "example1", "_type": "doc", "_id": "8036", "_score": 1, "_source": { "user": "kimchy8036", "postDate": "2009-11-15T13:12:00", "locations": [ [ 72.79887719999999, 21.193036000000003 ], [ -1.8262150000000001, 51.178881999999994 ] ] } } And below is mapping: { "example1": { "mappings": { "doc": { "properties": { "locations": { "type": "geo_point" }, "postDate": { "type": "date" }, "status": { "type": "long" }, "user": { "type": "text", "fields": {

问题 I'm working with a fairly large data set (100k rows) and want to replicate the Excel Index Match function in R Studio. I'm looking for a way to create a new column that will pull a value from an existing column ("1995_Number"), if 3 values from three different columns from one year match three values from three columns from another year - independent of the rows , and create a new column ("1994_Number"). Dataframe as example: dat <- data.frame(`1994_Address` = c("1234 Road", "123 Road", "321

问题 In Google Sheets, I have a table with dynamic cells that count the number of occurrences in a feed from Google Forms. At the left, in Column A there are names of items, and the columns at the right count how many times they are listed in the responses from the forms, so this values change as more responses are added. I am trying to make a report that mentions which item had the most instances per column. The formula I used initially works: =INDEX(INDIRECT("A$3:A$6"), 1, MATCH(MAX(B3:B6), B3

问题 In particular with respect to pattern matching and case classes. Consider the following: abstract class Expr case class Var(name: String) extends Expr case class Number(num: Double) extends Expr case class UnOp(operator: String, arg: Expr) extends Expr case class BinOp(operator: String, left: Expr, right: Expr) extends Expr object Expr { def simplify(expr: Expr): Expr = expr match { // Some basic simplification rules... case UnOp("-", UnOp("-", e)) => simplify(e) // Double negation case BinOp

问题 In particular with respect to pattern matching and case classes. Consider the following: abstract class Expr case class Var(name: String) extends Expr case class Number(num: Double) extends Expr case class UnOp(operator: String, arg: Expr) extends Expr case class BinOp(operator: String, left: Expr, right: Expr) extends Expr object Expr { def simplify(expr: Expr): Expr = expr match { // Some basic simplification rules... case UnOp("-", UnOp("-", e)) => simplify(e) // Double negation case BinOp

问题 I am using a regEx expression to filter out the youtube ID of a youtube link. I am using it in two different spots - It works great in the first spot... but the second time I use the same expresion, with the same input, it does not work. Here are the two functions. First - Here is the one that works. The user inputs the data in a text input, and it returns match[2], which is the youtube ID at the end of the link. The user can copy paste in a whole paragraph of text containing a youtube link,

问题 I am facing an issue in javascript dates, i want to match slot dates comparing start_date or end_date. my component {this.state.data && this.state.data.length ? this.state.data .filter(data => { const date = new Date(data.start_date); const enddate = new Date(data.end_date); console.log(date); //start console.log(enddate); //end return date > prevDate && date < nextDate; }) .map(({ cust_full_name, start_date }, index) => ( <div class="row" key={index}> slot: {index + 1} <p>{start_date}</p> <p