How to evaluate of "1<m<10=50,10<m<20=100 ;m=15" output result 100

[fssgh]

How to evaluate of "1<m<10=50,10<m<20=100 ;m=15" output result 100 ?

[josdejong]

Can you explain the meaning of your expression?

[fssgh]

meaning like this codes:
const scope = { m: 15 } print(math.evaluate([ '1<=m<=10=50', '10<m<=20=100' ], scope)) // 100
when 'm' in 1<=m<=10=50 range result is 50 , when 'm' in 10<m<=20=100 range result is 100。

[josdejong]

You can write:

const scope = { m: 15 } 
console.log(math.evaluate('(1 <= m and m <= 10) ? 50 : (10 < m and m <= 20) ? 100 : -1', scope)) // 100