re: Useful JS functions you aren't using: Array.filter VIEW POST

TOP OF THREAD FULL DISCUSSION
re: Nice work. Just a little note on the last couple of examples. If you want to do this in a functional style, it's important not to mutate state in t...
 

Quick Fix to get this example working:

students
.map(s => Object.assign({}, s, {age: parseInt(s.age, 10) + 1}))
.filter(s => s.age < 12)
.forEach(s => console.log(s));

Age should be parsed as integer, in order to get the addition working, otherwise it will be treated as a string and will result i.e, for age 10, in age: 101

 

Sure, although I'd argue that a better approach would be to represent the age as an integer in the data structure. Especially if the program is planning to perform arithmatic on it! :)

code of conduct - report abuse