Menu
When simplifying my code, a stack overflow user changed this line of code:
if (place > sequence.length -1) {
place = 0;
to this:
place = place % sequence.length;
and I'm wondering what this line actually does and how you would define the use of this line and the use of the percentage sign. Thanks for help in advance.
681
The % operator is one of the "Arithmetic Operators" in JavaScript, like / , * , + , and - . The % operator returns the remainder of two numbers. It is useful for detecting even/odd numbers (like to make stripes) and for restricting a value to a range (like to wrapping an animated ball around) .
One of them is the percent sign: % . It has a special meaning in JavaScript: it's the remainder operator. It obtains the remainder between two numbers. This is different from languages like Java, where % is the modulo operator.
$ and $$ are valid variable names in JavaScript, they have no special meaning. Usually they set their value to library instances, in your example if you check the closure call, at the end of the file you'll see that $ is jQuery in this case if it is defined and $$ is cytoscape.
The JavaScript percent sign doesn’t do modular arithmetic. It’s used for finding the remainder when the first operand is divided by the second operand. This is what JavaScript’s percent sign actually means. For example, if we write: we get 0 since 10 is evenly divisible by 2.
When comparing a string with a number, JavaScript will convert the string to a number when doing the comparison. An empty string converts to 0. A non-numeric string converts to NaN which is always false.
Comparing data of different types may give unexpected results. When comparing a string with a number, JavaScript will convert the string to a number when doing the comparison. An empty string converts to 0.
Like C, C++, Java, Python, and various other languages, JavaScript also supports Comparison operations. Comparison operators are used in logical expressions to determine their equality or differences in variables or values.
(%) is the modulus operator, it will let you have the remainder of place/sequence.length.
5 % 1 = 0 // because 1 divides 5 (or any other number perfectly)
10 % 3 = 1 // Attempting to divide 10 by 3 would leave remainder as 1
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
