problem description
there is a two-dimensional array: traverse each item and accumulate the corresponding items to generate a new array;
Code
var arr = [[1,2,3,1],[2,3,4,2],[3,4,5,3]];
//
var arr1 = [6,9,12,6];
there is a two-dimensional array: traverse each item and accumulate the corresponding items to generate a new array;
var arr = [[1,2,3,1],[2,3,4,2],[3,4,5,3]];
//
var arr1 = [6,9,12,6]; let arr = [[1,2,3,1],[2,3,4,2],[3,4,5,3]];
let arr1 = [];
for(let i=0;i<arr[0].length;iPP){
let sum = 0;
for(let j=0;j<arr.length;jPP){
sum += arr[j][i]
}
arr1.push(sum)
}
console.log("", arr1); // [6,9,12,6]var arr = [[1,2,3,1],[2,3,4,2],[3,4,5,3]];
function trans (arr) {
return arr.reduce((sum, item) => {
item.forEach((cur, index) => {
let num = sum[index] || 0
sum[index] = num + cur
})
return sum
}, [])
}
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