What does [object Object] mean?

The default conversion from an object to string is “[object Object]”. As you are dealing with jQuery objects, you might want to do to print the element’s ID. As mentioned in the comments, you should use the tools included in browsers like Firefox or Chrome to introspect objects by doing console.log(whichIsVisible()) instead of alert. Sidenote: … Read more

What does %s mean in a python format string?

It is a string formatting syntax (which it borrows from C). Please see “PyFormat”: Python supports formatting values into strings. Although this can include very complicated expressions, the most basic usage is to insert values into a string with the %s placeholder. Edit: Here is a really simple example: The %s token allows me to … Read more

How do I grep recursively?

The first parameter represents the regular expression to search for, while the second one represents the directory that should be searched. In this case, . means the current directory. Note: This works for GNU grep, and on some platforms like Solaris you must specifically use GNU grep as opposed to legacy implementation. For Solaris this … Read more

expected Error in java Compilation [duplicate]

well in class level you can only define attributes of that class, cant do any processing which you are doing in classA and classB. Processing can only be done in method. Just add main method make objects there Main method is entry point of any program in java. Dont worry if you are confused where … Read more

How do I determine the size of my array in C?

Executive summary: Full answer: To determine the size of your array in bytes, you can use the sizeof operator: On my computer, ints are 4 bytes long, so n is 68. To determine the number of elements in the array, we can divide the total size of the array by the size of the array … Read more

What does random.sample() method in python do?

According to documentation: random.sample(population, k) Return a k length list of unique elements chosen from the population sequence. Used for random sampling without replacement. Basically, it picks k unique random elements, a sample, from a sequence: random.sample works also directly from a range: In addition to sequences, random.sample works with sets too: However, random.sample doesn’t … Read more