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.keyCode vs. .which
...', function(event,handler){
switch(handler.key){
case "ctrl+a":alert('you pressed ctrl+a!');break;
case "ctrl+b":alert('you pressed ctrl+b!');break;
case "r":alert('you pressed r!');break;
case "f":alert('you pressed f!');break;
}
});
hotkeys understands the...
How to get first character of string?
...
What you want is charAt.
var x = 'some string';
alert(x.charAt(0)); // alerts 's'
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How to check if a query string value is present via JavaScript?
...Just to clarify, this works great if(/[?&]q=/.test(location.search)) { alert("match"); } (I was a bit confused due to @DragosDurlut comment. :)
– Leia
Apr 24 '17 at 4:24
1
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How can I check whether a option already exist in select by JQuery
..."#your_select_id option[value=<enter_value_here>]").length == 0 ){
alert("option doesn't exist!");
}
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What is the difference between String.slice and String.substring?
.... Too large values are truncated to the length of the string:
alert ( "testme" .substring (-2)); // "testme", -2 becomes 0
Furthermore, if start > end, the arguments are interchanged, i.e. plot line returns between the start and end:
alert ( "testme" .substring (4, -1)); // "test"
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How to initialize an array's length in JavaScript?
...}) gives you an array with length 5 and values 0,1,2,3,4.
Array(5).forEach(alert) does nothing, Array.apply(null, Array(5)).forEach(alert) gives you 5 alerts
ES6 gives us Array.from so now you can also use Array.from(Array(5)).forEach(alert)
If you want to initialize with a certain value, these are ...
Asynchronous Process inside a javascript for loop [duplicate]
...j = 10;
for (i = 0; i < j; i++) {
await asycronouseProcess();
alert(i);
}
Remember, this works only if asycronouseProcess is returning a Promise
If asycronouseProcess is not in your control then you can make it return a Promise by yourself like this
function asyncProcess() {
ret...
How Can I Browse/View The Values Stored in Redis [closed]
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Windows and OS X binaries now require a subscription.
– Somantra
Dec 18 '18 at 17:55
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How to determine whether an object has a given property in JavaScript
...roperty, opts)) {
throw new Error("IllegalArgumentException");
}
alert("ok");
}
f({req1: 123}); // error
f({req1: 123, req2: 456}); // ok
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Pass parameters in setInterval function
...the "spread" operator
function repeater(param1, param2, param3){
alert(param1);
alert(param2);
alert(param3);
}
let input = [1,2,3];
setInterval(repeater,3000,...input);
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