4. JS commonly used functions
tags: js javascript
1. Array
1. reduce()
- Definition: Reduce () method receives a function as a cumulator. Each value (from left to right) in the array is reduced, and the final calculation is a value.
- grammar:
array.reduce(function(total, currentValue, currentIndex, arr), initialValue) - Example:
Calculate the sum of the addition of the array element: (Result: 125)
var numbers = [65, 44, 12, 4];
function getSum(total, num) {
return total + num;
}
function myFunction(item) {
document.getElementById("demo").innerHTML = numbers.reduce(getSum);
}
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