I have multiple arrays in javascript and I want to do sum of those arrays and final array.
EX: Array1 = [1,9,10,11], Array2 = [5,8,7,2], Total = [6,17,17,13].
asked Jul 30, 2012 at 6:09
Briskstar Technologies
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6 Answers
Pure function with multiple arrays:
function sum(arrays) {
return arrays.reduce((acc, array) => acc.map((sum, i) => sum + array[i]), new Array(arrays[0].length).fill(0));
}
const arrays = [
[4, 6, 3, 2],
[1, 4, 7, 9],
[4, 6, 3, 2],
[1, 4, 7, 9]
];
const result = sum(arrays);
console.log(result);
1 Comment
ᴍᴇʜᴏᴠ
Thank you for the answer! Your one-liner is very good! I went into the Edit mode to play with it in the preview without saving and I got to understand it better, this was very useful
var Array1 = [1,9,10,11];
var Array2 = [5,8,7,2];
var Total = [];
for( var i = 0; i < Array1.length; i++)
{
Total.push(Array1[i]+Array2[i]);
}
BTW, starting variable names in capital letters feels awkward.
Comments
var Array1 = [1,9,10,11];
var Array2 = [5,8,7,2];
var Total = new Array();
for(var i= 0;i<Math.min(Array1.length,Array2.length);i++){
Total.push(Array1[i]+Array2[i]);
}
alert(Total);
Comments
function aSum(/*arrays list*/){
var total=[],undefined;
for(var i=0,l0=arguments.length;i<l0;i++)
for(var j=0,arg=arguments[i],l1=arg.length;j<l1;j++)
total[j]=(total[j]==undefined?0:total[j])+arg[j];
return total;
}
var Array1 = [1,9,10,11], Array2 = [5,8,7,2], Array3 = [1,2,3,4,8];
console.log(aSum(Array1, Array2, Array3)); // [7, 19, 20, 17, 8]
Comments
Arrow function in ES6
var Array1 = [1,9,10,11];
var Array2 = [5,8,7,2];
var sum = Array1.map((val, idx) => val + Array2[idx]);
console.log(sum);
Comments
const a1 = [1, 9, 10, 11];
const a2 = [5, 8, 7, 2];
const a3 = Array.from(a1, (v, i) => v + a2[i]);
console.log(a3);
1+9+10+11 + 5+8..., or do you want[1+5+6, 9+8+17, ...]