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Get the first key name of a javascript object [duplicate]
Let's assume we have the following javascript object:
8 Answers
8
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Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?
...re two methods of building a link that has the sole purpose of running JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.?
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Hidden Features of JavaScript? [closed]
...t I'll take just one for you, always use === and !== instead of == and !=
alert('' == '0'); //false
alert(0 == ''); // true
alert(0 =='0'); // true
== is not transitive. If you use === it would give false for
all of these statements as expected.
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Can't find the 'libpq-fe.h header when trying to install pg gem
...
If you then are required to have a javascript library installed... gem install 'execjs' and gem install 'therubyracer'
– Nick Woodhams
Apr 26 '12 at 10:30
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importing pyspark in python shell
...efault, thus an import pyspark will fail at command line or in an executed script. You have to either a. run pyspark through spark-submit as intended or b. add $SPARK_HOME/python to $PYTHONPATH.
– kingledion
Oct 10 '19 at 16:10
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jQuery callback for multiple ajax calls
...estsCompleted({
numRequest: 3,
singleCallback: function(){
alert( "I'm the callback");
}
});
//usage in request
$.ajax({
url: '/echo/html/',
success: function(data) {
requestCallback.requestComplete(true);
}
});
$.ajax({
url: '/echo/html/',
success: f...
Declaring abstract method in TypeScript
... abstract makeSound(input : string) : string;
move(meters) {
alert(this.name + " moved " + meters + "m.");
}
}
class Snake extends Animal {
constructor(name: string) { super(name); }
makeSound(input : string) : string {
return "sssss"+input;
}
move() {
...
Get value of a string after last slash in JavaScript
...
var str = "foo/bar/test.html";
var lastSlash = str.lastIndexOf("/");
alert(str.substring(lastSlash+1));
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Import SQL file into mysql
...their own benefits in the results they display.
In the first approach, the script exits as soon as it encounters an error. And the better part, is that it tells you the exact line number in the source file where the error occurred. However, it ONLY displays errors. If it didn't encounter any errors,...
Case-insensitive search
...var result = string.match(/best/i);
// result == 'BEST';
if (result){
alert('Matched');
}
Using a regular expression like that is probably the tidiest and most obvious way to do that in JavaScript, but bear in mind it is a regular expression, and thus can contain regex metacharacters. If you ...