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You should quote a variable expansion or it will be split on IFS and become more elements.
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user232326
user232326

With a for loop:

for i in $"${DOMAINS[@]};"; do s_domain+=(0); done

With a for loop:

for i in ${DOMAINS[@]}; do s_domain+=(0); done

With a for loop:

for i in "${DOMAINS[@]}"; do s_domain+=(0); done
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schrodingerscatcuriosity
schrodingerscatcuriosity
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With a for loop:

for i in ${DOMAINS[@]}; do s_domain+=(0); done