What does this mean

Question

In an array someone defined it as arr then said

for(x=0;x<arr.length;x++)

What does this mean and what does it do

Answer 1

its an for loop.
its work likr this
for(x=0;x<arr.lenght;x++)
its define x's value as 0
if zero is bigger than arr.lenght(number of character in an array).x will be plus one

Answer 2

for example =
var arr = [5,2,0,1]
//this array's length is 4
for(x=0;x<arr.length;x++)
//if x is still smaller than 4 it will be plus by one
so x is 4

Answer 3

How come someone used it in a snake game for the tail length ?

Answer 4

The loop for while repeat instructions while the condition is true.

You have 3 parts seperated by semilicons:
-the definition of the variable you'll use in the condition
-the condition
-the operation to change the value of the variable

So the condition with words means: while x is smaller than the length of the variable arr

When the loop is finished, the new value of x is x+1.

After that, the computer will check if the condition return true or false. If true, it run the loop again, if false, it stop the loop

Answer 5

@jerome many people use loop to making map because it is short to write