Simplify Nested If Else Statement In Javascript

I'm currently doing a body mass index calculation using html css and javascipt (using jquery library). In javascript or other programming language, how can I simplify multiple nest

Solution 1:

It can be simplified quite a bit if you supply a nested array with the "decision points":

functionbmi(age,b) {
  const text=["underweight","healthy","overweight","obese","obese II","obese III"],
        o={9:[14,   18.6, 21          ],
          10:[14.2, 19.4, 22.2        ],
          11:[14.6, 20.2, 23.2        ],
          12:[15,   21,   24.2        ],
          13:[15.4, 21.8, 25.2        ],
          14:[16,   22.6, 26          ],
          15:[16.6, 23.4, 26.8        ],
          16:[17.2, 24.2, 27.6        ],
          17:[17.8, 24.8, 28.2        ],
          18:[18.5, 25,   30,  35,  40]};
  let sc=o[Math.min(age,18)];
  if (!sc) return"too young for BMI";
  let i=sc.findIndex(v=>v>b);
  if (i==-1) i=sc.lengthreturn text[i]
}
const tests=[[8,18],[12,23],[13,25],[14,26],[15,27],[16,16],[17,22],[22,42]];
tests.forEach(([age,b])=>console.log(age+"y, bmi="+b+" : "+bmi(age,b)))

Solution 2:

A way to simplify/beautify if statements is to use switch statements

For javascript: https://www.w3schools.com/js/js_switch.asp