I'm struggling with what seems like a basic issue. I have an array that looks like this:
var myArray = [{a:3, b:4, c:5}, {a:-1, b:3, c:5}, {a:0, b:-3, c:1}];
I need to create a loop to add up all the values for 'a', 'b', and 'c' in each object of the array. The challenge is that I don't know how many objects will be in the array beforehand.
For example, instead of manually adding up the values like this:
var A = myArray[0].a + myArray[1].a + myArray[2].a;
You can utilize the reduce() function to calculate and return the result for each key in separate variables.
var myArray = [{a:3, b:4, c:5}, {a:-1, b:3, c:5}, {a:0, b:-3, c:1}];
var A = myArray.reduce(function(r, e) {
return r + e.a;
}, 0)
console.log(A)Alternatively, you can employ both reduce() and Object.keys() to compute the sum for each property of the objects in a single variable.
var myArray = [{a:3, b:4, c:5}, {a:-1, b:3, c:5}, {a:0, b:-3, c:1}];
var result = myArray.reduce(function(r, e) {
Object.keys(e).forEach(function(k) {
r[k] = (r[k] || 0) + e[k];
});
return r;
})
console.log(result);Perhaps this can be of assistance.
let totalA = 0, totalB = 0, totalC = 0;
myDataArray.forEach(function(item){
if (item.hasOwnProperty("a") {totalA += item["a"];}
if (item.hasOwnProperty("b") {totalB += item["b"];}
if (item.hasOwnProperty("c") {totalC += item["c"];}
});
Consider using the forEach() method:
let numberArray = [{x:3, y:4, z:5}, {x:-1, y:3, z:5}, {x:0, y:-3, z:1}];
let totalX = 0;
numberArray.forEach(item => {totalX += item.x});
console.log(totalX); // Output: 2
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