conditional

问题 I have an issue with some JSON I'm parsing into a template. Essentially, I'm constructing a query via a simple web interface, pulling back data in JSON format, and controlling the data/template with Mustache. However, I'm unable to query values on nested objects in the JSON via the URL...so I think I need to resort to conditional statements using Handlebars. Is it possible to run a like or indexof style comparison in an handlebars block helper using wildcards? i.e. {{#if folderPath ==

问题 This question already has answers here : Why is “if not someobj:” better than “if someobj == None:” in Python? (9 answers) Closed 5 years ago . if not start: new.next = None return new what does "if not" mean? when will this code execute? is it the same thing as saying if start == None: then do something? 回答1: if is the statement. not start is the expression, with not being a boolean operator. not returns True if the operand ( start here) is considered false . Python considers all objects to

问题 Essentially, I'd love to be able to define a variable as one thing unless that thing doesn't exist. I swear that somewhere I saw a shorthand conditional that looked something like this: $var=$_GET["var"] || "default"; But I can't find any documentation to do this right, and honestly it might have been JS or ASP or something where I saw it. I understand that all that should be happening in the above code is just to check if either statement returns true. But I thought I saw someone do

问题 Essentially, I'd love to be able to define a variable as one thing unless that thing doesn't exist. I swear that somewhere I saw a shorthand conditional that looked something like this: $var=$_GET["var"] || "default"; But I can't find any documentation to do this right, and honestly it might have been JS or ASP or something where I saw it. I understand that all that should be happening in the above code is just to check if either statement returns true. But I thought I saw someone do

问题 I would like to conditionally alter the color/face/etc of a continuous tick mark label using logic instead of hard coding. For example: library(tidyverse) library(viridis) xx=rpois(1000,lambda = 40) y=density(xx,n=3600,from=0) ggplot(data.frame(x = y$x, y = y$y), aes(x, y)) + geom_line() + geom_segment(aes(xend = x, yend = 0, colour = y)) + scale_color_viridis() + labs(y='Density',x='Count',colour='Density')+ geom_vline(xintercept=40,color='red') + scale_x_continuous(breaks=c(0,40,seq(25,100

问题 I would like to conditionally alter the color/face/etc of a continuous tick mark label using logic instead of hard coding. For example: library(tidyverse) library(viridis) xx=rpois(1000,lambda = 40) y=density(xx,n=3600,from=0) ggplot(data.frame(x = y$x, y = y$y), aes(x, y)) + geom_line() + geom_segment(aes(xend = x, yend = 0, colour = y)) + scale_color_viridis() + labs(y='Density',x='Count',colour='Density')+ geom_vline(xintercept=40,color='red') + scale_x_continuous(breaks=c(0,40,seq(25,100

问题 I would like to conditionally alter the color/face/etc of a continuous tick mark label using logic instead of hard coding. For example: library(tidyverse) library(viridis) xx=rpois(1000,lambda = 40) y=density(xx,n=3600,from=0) ggplot(data.frame(x = y$x, y = y$y), aes(x, y)) + geom_line() + geom_segment(aes(xend = x, yend = 0, colour = y)) + scale_color_viridis() + labs(y='Density',x='Count',colour='Density')+ geom_vline(xintercept=40,color='red') + scale_x_continuous(breaks=c(0,40,seq(25,100

问题 I would like to conditionally alter the color/face/etc of a continuous tick mark label using logic instead of hard coding. For example: library(tidyverse) library(viridis) xx=rpois(1000,lambda = 40) y=density(xx,n=3600,from=0) ggplot(data.frame(x = y$x, y = y$y), aes(x, y)) + geom_line() + geom_segment(aes(xend = x, yend = 0, colour = y)) + scale_color_viridis() + labs(y='Density',x='Count',colour='Density')+ geom_vline(xintercept=40,color='red') + scale_x_continuous(breaks=c(0,40,seq(25,100

问题 Is it possible with MapStruct 1.2 to map a source property with a specific value to a specific different value in the target? I think about something like this: public abstract class JiraKpmMapper { @Mappings({ @Mapping(source = "mySource.propA", target = "myTarget.propX") }) @ValueMappings({ @ValueMapping(source = "ABC", target = "XYZ"), @ValueMapping(source = "123", target = "789") }) public abstract MyTarget source2Target(final MySource mySource); } So that when MapStruct sees during the

问题 How to write a conditional statement in Z3. eg: if (a%2==0){ value=1 } I am trying to achieve this in Z3 Solver by Microsoft Research but so far no luck 回答1: Look up SSA form: https://en.wikipedia.org/wiki/Static_single_assignment_form Essentially, you'll have to change your program to look something like: value_0 = 0 value_1 = (a%2 == 0) ? 1 : value_0 Once it is in this so called static single assignment form, you can now translate each line more or less directly; with the latest assignment