the following code goes into infinite loop and a crash in the webpage I need to know what's wrong with it?
for (var i = 0; i < 2; i+1) {
for (var j = i; j < 8; j + 2) {
console.log(arr[j].Qu);
}
console.log(arr[i]);
}
i+1 doesn't update i's value, therefor, the i always has value 1, as it takes 0+1 in every run, thus never being > 2 and never ending You need to change it with i++, like this
for (var i = 0; i < 2; i++) {
Also, as @Xufox points out, udpate your J loop with
for (var j = i; j < 8; j += 2) {
i+1 is not an assign operation, that's why you need to assign the value urself. i++ and j+=2 translate to
i = i+1;
j= j+2;
and the result of the righthand operation is self-assigned to the variable
j which should be j += 2.
i using assignment operator i = i + 1 or use the increment operator i++ which is short-cut for same.
i + 1 will just return the value of i + 1. In order to save that value back into the variable you would have to do something like this : i = i+1 or the shorthand version i++.
Value is not assigned back to variable.
for (var i = 0; i < 2; i+=1) { // i++
for (var j = i; j < 8; j+=2) {
console.log(arr[j].Qu);
}
console.log(arr[i]);
}
i+1 doesn't modify i value.
You could write instead i++.
Similarly, j + 2 doesn't update j.
You should write j += 2.
Here is the corrected code :
for (var i = 0; i < 2; i++) {
for (var j = i; j < 8; j += 2) {
console.log(arr[j].Qu);
}
console.log(arr[i]);
}
for (var i = 0; i < 2; i+=1) {
for (var j = i; j < 8; j+= 2) {
console.log(arr[j]);
}
console.log(arr[i]);
}
jequalsi?