javascript code

Question

i don't understand the result of this code. can you help me, please?
var k=[[0,6,4],[2,3,1],[7,2,2]];
var s=3;
var i;
for(i=0;i<k.length;i++){
s=s+k[i][2];
}
alert(s)

Answer 1

var k=[[0,6,4],[2,3,1],[7,2,2]];
var s=3;
var i;
for(i=0;i<k.length;i++){
s=s+k[i][2];
}
alert(s)
in this code output is 10 it came like this
length of array k is 3
k=3
s=3
for loop is execute till i<k.length which is
i<3so for i=0,1,2 the loop will execute so
s=s+k[i][2]
k[0]=[0,6,4] =>k[0][2]=4
k[1]=[2,3,1]=>k[1][2]=1
k[2]=[7,2,2]=>k[2][2]=2
then it execute like this
s=s+k[0][2] which is equal to =>3+4=7 so s=7
s=s+k[1][2] which is equal to=>7+1=8
s=s+k[2][2] which is equal to=>8+2=10
so output become 10