I have variable with string values in two dimensional array format.
var arrayList=[["1","2"],["6","3600","11","60"],["1","2","3","4","5","6"]];
What I want,each odd position value multiply with next even position and finally adding that values
like.
["1","2"]=(1*2);
["6","3600","11","60"]=((6*3600)+(11*60));
["1","2","3","4","5","6"]=((1*2)+(3*4)+(5*6))
for this I written the following code,second and third cases are not working.
really sorry might be it's very basic question but I tested each and every line it's seems code is correct but in second and third cases getting Nan
.
var result=[];
for (var index = 0; index < arrayList.length; index++) {
var innerResult=0;
for (var jndex = 0; jndex < arrayList[index].length; jndex++) {
var cali=parseInt(arrayList[index][jndex])*parseInt(arrayList[index][jndex+1]);
innerResult=innerResult+cali;
jndex=jndex+2;
};
result.push(innerResult);
};
result
I am getting like this [3,Nan,Nan]
.
please can anyone help me.
Thanks
You're incrementing jndex
on each loop and then you are adding 2 more at the end of that loop. You have two options, changing this:
for (var jndex = 0; jndex < arrayList[index].length; jndex++) {
to:
for (var jndex = 0; jndex < arrayList[index].length; jndex+=2 ) {
or this:
jndex=jndex+2;
to:
jndex=jndex+1;
If you do the first one, you no longer need the increment within the loop.
I have written this algorithm that I believe might help you.
var array = [["1","2"],["6","3600","11","60"],["1","2","3","4","5","6"]];
array.map(function(subArray){
var total = 0;
for(var i = 1; i < subArray.length; i += 2)
total += parseInt(subArray[i], 10) * parseInt(subArray[i - 1], 10);
return total;
});
The jindex
will be incremented by the loop as well. This will mean the jindex
is incremented by 3 each loop.
Consider the case where jindex
is arrayList[index].length - 1
; when you parseInt(arrayList[index][jndex+1])
you will reach outside the bounds of the array, and get undefined
(and parseInt(undefined)
is NaN
again).
If you fix those, you should find your code works;
var result = [];
for (var index = 0; index < arrayList.length; index++) {
var innerResult = 0;
for (var jndex = 0; jndex < arrayList[index].length - 1; jndex++) {
var cali = parseInt(arrayList[index][jndex]) * parseInt(arrayList[index][jndex + 1]);
innerResult = innerResult + cali;
jndex = jndex + 1;
};
}
Try this:
var result = [];
for (var index = 0; index < arrayList.length; index++) {
var innerResult = 0;
for (var jndex = 0; jndex < arrayList[index].length;) {
var cali = (parseInt(arrayList[index][jndex]) * parseInt(arrayList[index][jndex + 1]));
innerResult = innerResult + cali;
jndex = jndex + 2;
}
result.push(innerResult);
}
Inner for loop changed to while loop (you have double increment in for loop):
var result = [];
for (var index = 0; index < arrayList.length; index++) {
var innerResult = 0;
var j = 0;
while (j < arrayList[index].length) {
var cali = parseInt(arrayList[index][j]) * parseInt(arrayList[index][j + 1]);
innerResult = innerResult + cali;
j += 2;
}
result.push(innerResult);
};
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