I'm beginner and have one question.
I have one um array and need show just 2 in 2 elements of array elements, my code is:
var datas = [];
followTotalsData.forEach(function(dataByDay) {
datas.push(dataByDay[1]);
});
datas = [1, 2 , 3 , 4, 5, 6, 7, 8, 9, 10];
But I need the array formated as
var newDatas = [2, 4, 6, 8, 10];
I'm interpreting your question as
How can I only get Numbers that are multiples of
2from my Array of Numbers
Use the remainder operator %.
If x % y is 0 then y divides x.
var datas = [1, 2 , 3 , 4, 5, 6, 7, 8, 9, 10];
var newDatas = datas.filter(function (e) {return e % 2 === 0;});
// [2, 4, 6, 8, 10]
Another solution:
var followTotalsData = [1, 2, 3, 4];
var result=[];
followTotalsData.forEach(function(data) {
if (data % 2 == 0 ) result.push(data);
});
console.log(result);
If you want every other element of the array, use the modulus function on the index of the array:
var datas = [1, 2 , 3 , 4, 5, 6, 7, 8, 9, 10];
var newDatas = datas.filter(function (e, index) {return index % 2 === 1;});
// [2, 4, 6, 8, 10]
var newDatas = datas.filter(function (e, index) {return index % 2 === 0;});
// [1, 3, 5, 7, 9]
