find sum of Boolean values JavaScript object array

javascript arrays typescript javascript-objects typescript2.0

var result = myObj.reduce((sum, next) => sum && next.status, true);

This should return true, if every value is true.

javascript arrays typescript javascript-objects typescript2.0

If you want to sum lets say, day items value depending on the status flag, this can looks like:

var result = myObj.reduce((res, item) => item.status ? res + item.day : res, 0);

For overall status in case of all statuses are true you should use every method:

var result = myObj.every(item => item.status);

javascript arrays typescript javascript-objects typescript2.0

You could use Array.some with predicate a => !a.status or Array.every with predicate a => a.status.

Either of them will short-circuit if you find a mismatch, while Array.reduce will not.

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