Methods for summing JavaScript arrays: 1. for loop, the code is [for (var i = 0; i
The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.
Methods for summing JavaScript arrays:
1. for loop
var sum = 0;
console.time("for");
for (var i = 0; i < arr.length; i++) {
sum += arr[i];
}
console.timeEnd("for");
console.log(sum);
2. while loop
var sum = 0;
function getSum(item, index, array) {
sum += item;
}
console.time();
arr.forEach(getSum);
console.timeEnd();
console.log(sum);
3. some method
var sum = 0;
function getSum(item, index, array) {
sum += item;
}
console.time();
arr.some(getSum);
console.timeEnd();
console.log(sum);
var sum = 0;
function getSum(item, index, array) {
sum += item;
}
console.time();
arr.map(getSum);
console.timeEnd();
console.log(sum);
var sum = 0;
function getSum(item, index, array) {
sum += item;
}
console.time();
arr.filter(getSum);
console.timeEnd();
console.log(sum);
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