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I know javascript but I don't understand the code in struct.js git repo. Does it use ES6? Can anyone explain the macros from that code and where can I find more information about it?
The code look like this:
let function = macro {
case { _ $id $args { $expr ... } } => {
var SP = makeIdent('SP', #{$name});
return withSyntax($SP = [SP]) {
return #{
function $id $args {
var $prevSP = $SP;
$expr ...
$SP = $prevSP;
}
}
}
}
}
That code don't work on Chromium (v. 30 on Xubuntu) I've also try to run it on node v0.10.22. Where can I test this code?
That code uses a preprocessor to convert from sweet.js to Javascript.
It's not bare Javascript.
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Suppose the JavaScript variable is:
var sourceString="stack {overflow} is the best {place} to clear {technical} doubts";
Output javascript string array should contain: overflow,place,technical
or {overflow},{place},{technical}
I am fine with both the results.
You could use regex to accomplish this:
sourceString.match(/{.*?}/g)
var getMatchingGroups = function(s) {
var r=/\{(.*?)\}/g, a=[], m;
while (m = r.exec(s)) {
a.push(m[1]);
}
return a;
};
getMatchingGroups(sourceString) // ["overflow", "place", "technical"]
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I am trying to learn javascript and I found an example but icant make it run What am i doing wrong
function CheckForPastDate(sender, args) {
selectedDate = sender._selectedDate;
var todayDate = new Date();
if (selectedDate.getDateOnly() < todayDate.getDateOnly()) {
sender.selectedDate = todayDate;
sender._textbox.set_Value(sender.selectedDate.format(sender._format));
alert("Wrong date!");
}
}
You made couple of mistakes in your code assuming that the code written is in javascript
Date comparisons need to be like this
if (selectedDate.getTime() < todayDate.getTime()) {
And you cannot format the dates in Javascript.
You can use the API available if you want.
Like the one I used MomentJS
sender._textbox.value = moment(sender.selectedDate).format(sender._format);
See my sample: http://jsfiddle.net/vinodgubbala/6MEG6/
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Writing a function in JavaScript. The plan is the function creates an object, which requires boolean statements as parameters. Something like this ->
var foo = new fuzz("pie < squirrel", "monkey === banana");
My question is - Is this evil?
*Note - * Inside the function 'fuzz' I will run checks on the values of the parameters. (Check string.length etc). I think this is how one is meant to use eval, it just has such a bad reputation on t'up web.
Thanks
Summing up the conclusions in the comments: write a simple rule evaluation engine! E.g.:
var variables = { ... };
function niceEval(condition) {
var operands = condition.match(/(\w+)\s+(\S+)\s+(\w+)/);
switch (operands[2]) {
case '<' :
return variables[operands[1]] < variables[operands[3]];
...
}
}
This also gives you a lot more control over possibly occurring errors than blindly evaling a string.
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I have three tabs and I want to navigate when I click on each one of them. The code that I wrote is working just fine, but I believe that is bad coding, there is any way to improve this is just for learning purposes. Thanks!!!!
jQuery(".nuestra_actualidad li:eq(0)").click(function() {
jQuery("#tabs-actualidad").css("display","block");
jQuery("#tabs-articulos").css("display","none");
jQuery("#tabs-noticias").css("display","none");
});
jQuery(".nuestra_actualidad li:eq(1)").click(function() {
jQuery("#tabs-actualidad").css("display","none");
jQuery("#tabs-articulos").css("display","block");
jQuery("#tabs-noticias").css("display","none");
});
jQuery(".nuestra_actualidad li:eq(2)").click(function() {
jQuery("#tabs-actualidad").css("display","none");
jQuery("#tabs-articulos").css("display","none");
jQuery("#tabs-noticias").css("display","block");
});
Replacing jQuery with $ if possible (unless it clashes with another library) and then it can be reduced to a single function by utilising the index of the clicked element and calling the toggle function:
$(".nuestra_actualidad li").click(function() {
var index = $(this).index();
$("#tabs-actualidad").toggle(index === 0);
$("#tabs-articulos").toggle(index === 1);
$("#tabs-noticias").toggle(index === 2);
});
Example - http://jsfiddle.net/gSKeL/
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I'm trying to get the id of an radiobutton to be added to href when the link is clicked. I tried searching google for a long time. But maybe i'm missing because it's very basic.
I do have a bit of code written but it doesn't work. Help?
function ProductIDLink() {
var url = "/bbbb/aaaaaaa/" + ('.aaasaff:radio:checked').attr('id');
$("#safad").attr("href", url)
}
Looks like you've just forgotten a $:
... ('.aaasaff:radio:checked').attr('id')
should be
... $('.aaasaff:radio:checked').attr('id')
From what I can see the $ was missing.
function ProductIDLink() {
var url = "/bbbb/aaaaaaa/" + $('.aaasaff:radio:checked').attr('id');
$("#safad").attr("href", url)
}