I have a question about this particular for loop:
for (var i=0,j=0;i<4,j<20;i++,j++) {
a=i+j;
}
console.log(a);
Can someone explain why the output is 38? I initially expected it to be 6.
I have a question about this particular for loop:
for (var i=0,j=0;i<4,j<20;i++,j++) {
a=i+j;
}
console.log(a);
Can someone explain why the output is 38? I initially expected it to be 6.
Check out the values of i and j, you will notice that they both reach 19 by the end of the loop, even if the condition causing the loop to stop is related to j
Open up your debugger and execute the following code:
for(var i=0,j=0;i<4,j<20;i++,j++){
ab=i+j;
console.log("i", i);
console.log("j",j);
console.log("a", a);
}
It is recommended to use the logical operator && instead of the comma operator in your code. I have included additional console.log statements to display the intermediate steps.
for(var i=0,j=0;i<4 && j<20;i++,j++){
a=i+j;
console.log("a: "+a+ " i+j:" + (i+j))
}
console.log(a);
To illustrate the difference between comma separated conditions and && separated conditions, compare the original version of your for loop with the updated version:
for(var i=0,j=0;i<4,j<20;i++,j++){
a=i+j;
console.log("(i<4, j<20): " + (i<4, j<20))
console.log("(i<4 && j<20): " + (i<4 && j<20))
}
console.log(a);
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