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Unexpected result with a multi dimensional array in a For loop
Any idea why the code below returns:
0,2,4,0,2,4,0,2,4and not:
0,0,0,1,2,3,2,4,6Many thanks
getPropertyArrayFromString();function getPropertyArrayFromString(str_1) {
n_1 = 3;
n_2 = 3;
tArray_1 = new Array();
pArray_1 = new Array();
for(n_3=0; n_3<n_1; n_3++) {
for(n_4=0; n_4<n_2; n_4++) {
tArray_1[n_4] = n_3 * n_4;
}
pArray_1[n_3] = tArray_1;
}
return(pArray_1);
}JimJam•Graphics
https://www.jimjamgraphics.com/ -
4 Replies
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I’d try initializing tArray_1 before the inner loop:
tArray_1 = [];
I would expect [[0,0,0],[0,1,2],[0,2,4]]
Dan
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Thanks Dan.
As always it seems obvious as soon as someone much more clever points it out to you! 😉
JimJam•Graphics
https://www.jimjamgraphics.com/ -
I think there’s a better way. What was happening was that each element of pArray_1 was getting a pointer to tArray_1 instead of the data in the array, so at the end of the routine pArray_1 consisted of three pointers to tArray_1, which had the last values. I think the correct way to fix this is to use slice() to get the data from the array, like this:
pArray_1[n_3]= tArray_1.slice();
Dan
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