I'm working in a JavaScript project where in this case I am trying to get the two arrays with the biggest value in position 2.
[-20.172, 35.251, 0],
[-16.368, 21.792, 26.81],
[-29.311, 18.393, 0],
[14.54, 15.23, 0],
[-1.61, 12.91, 27.692],
[0, 0, 0]
the intended answer should be like this:
[-16.368, 21.792, 26.81],
[-1.61, 12.91, 27.692]
I can't sort by the ones that have a zero and the ones who doesn't have it, some other cases in the project I'm working could possibly have different numbers on the position 2.
any suggestions?
I can't sort by the ones that have a zero
Could it be the array is declared const?
var topTwo = function ( array_of_arrays ) {
return array_of_arrays.sort((a, b) => b[2] - a[2])
.slice(0, 2) ;
};
var arr = [
[-20.172, 35.251, 7],
[-16.368, 21.792, 26.81],
[-29.311, 18.393, 0],
[14.54, 15.23, 0],
[-1.61, 12.91, 27.692],
[0, 0, -3]
];
console.log( topTwo(arr) );
Using Array#reduce:
const arr = [
[-20.172, 35.251, 0],
[-16.368, 21.792, 26.81],
[-29.311, 18.393, 0],
[14.54, 15.23, 0],
[-1.61, 12.91, 27.692],
[0, 0, 0]
];
const [max1Index, max2Index] = arr.reduce(([max1Index, max2Index], { 2: num }, index) => {
const max1 = arr[max1Index][2], max2 = arr[max2Index][2];
return num > max1
? [index, max1Index]
: num > max2
? [max1Index, index]
: [max1Index, max2Index];
}, [0, 0]);
console.log(arr[max1Index], arr[max2Index]);