If you make an array indexed by ageGroup, whose values are objects containing the hemoglobineValue and its associated lower threshold for that age group, you can iterate through the object's entries to .find the first matching entry:
const hValues = [
// Age group 0:
{
AST: 6.9,
AS: 7.9,
AM: 11.4,
AL: 13.4,
HN: 19.8,
PL: 100
},
// Age group 1:
{
AST: 6.9,
AS: 7.9,
AM: 9.9,
AL: 10.9,
HN: 13,
PL: 100
}
// etc
]
function hemoglobine() {
hemoglobineInput.addEventListener('input', () => {
const input = Number(document.querySelector('#hemoglobina').value);
const entry = Object.entries(hValues[ageGroup])
.find(([, threshold]) => input <= threshold);
const hemoglobineContainerValue = entry[0];
});
}
You could also use an array of arrays instead of an array of objects in hValues to make things more concise, and have a separate array containing the hemoglobineValue strings, but IMO that data structure would be a bit harder to understand at a glance.
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