I want to find the numeric difference between 2 values inside an object.
My objects are done like this:
{ today: 9, lastMonth: 6 }
I'm inside an every() method:
const validation = Object.values(myObj).every(item => console.log(item))
The every method is inside a reduce() method, because i have an array of object like the one i write up here.
Right now item log is printing value without any connection to the previous object, but one by one, so seems that i can't do a difference between the value like so:
function difference(a, b) {
return Math.abs(a - b);
}
What i expect:
(item => difference(item))
to find the difference between the 2 values present in my object
What is happening:
Difference is returning NaN because item are not taken together
Edit: I fixed the main problem, now i have a simple array like so:
[[0,2],[4,9],[5,7]]...
seems that Math.abs(a-b) doesn't work with array, there is a valid solution to this?
If you use the spread syntax (...) as you call the difference function the result should be as expected.
I'd suggest creating a wrapper getDifferences() function to implement this:
function difference(a, b) {
return Math.abs(a - b);
}
function getDifferences(arr) {
return arr.map(el => difference(...Object.values(el)));
}
console.log(getDifferences([{ today: 9, lastMonth: 6 }]));
console.log(getDifferences([[0,2],[4,9],[5,7]]));
console.log(getDifferences([{ a: 1, b: 2 }, { x: 1, y: 3 }]));.as-console-wrapper { max-height: 100% !important; }You could also use function.apply, this will also allow you to pass an array of arguments to a function:
function difference(a, b) {
return Math.abs(a - b);
}
function getDifferences(arr) {
return arr.map(el => difference.apply(null, Object.values(el)));
}
console.log(getDifferences([{ today: 9, lastMonth: 6 }]));
console.log(getDifferences([[0,2],[4,9],[5,7]]));
console.log(getDifferences([{ a: 1, b: 2 }, { x: 1, y: 3 }]));.as-console-wrapper { max-height: 100% !important; }Try
function difference(array) {
var result = [];
for(var i=0;i<array.length;i++){
result.push(Math.abs(array[i][0]-array[i][1]));
}
return result
}
var arr = [[0,2],[4,9],[5,7]]
console.log(difference(arr))