i have the following loop which is iterating through an array and i try to access the next position of the current position in the array.
for( var i in myArray){
var temp = myArray[i+1];
}
The problem is that it not add the 1 with the var i but it just appends the number 1 on the i. Like i is 2 and i do this
i+1
the result is
21
and not 3.
Why is this so and how can i add the two variables?
Basically you are iterating over the keys of an object (an array is an object) and the keys are always strings (or symbol type in ES6). For converting to a number, you could just add an unary plus in front of it for converting a stringed number to a number.
var temp = myArray[+i + 1];
You might use better the classical iteration with a counter, like
var i, temp;
for (i = 0; i < array.length; i++) {
temp = array[i + 1];
// some more code
}
because for ... in iterates over all enumerable properties of the object, if exist. For more information read Why is using “for…in” with array iteration a bad idea?
Parseint should be used to add two varibles
var test1= parseInt(10);
var test2= parseInt(20);
alert(test1+test2); // should now alert 30
This is how you can add two variables in Javascript....
var temp = myArray[parseInt(i)+1];