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JavaScript Array reduce() Method
JavaScript Array reduce() Method
JavaScript array reduced() methodis used to reduces the given array into a single value by executing a provided function and the return value of the function is stored in an accumulator. Therefore, it executes a provided function for each value of the array (from left to right).
Syntax:
array.reduce(function(total, currentValue, currentIndex, arr), initialValue)
Parameter Values
| Parameter | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| function(total,currentValue, index,arr) | Itrequired to be run a function for each element in the array Function arguments:
|
||||||||||
| initialValue | It isOptional and a value to be passed to the function as the initial value |
Browser Support
| Method | Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|---|
| reduce() | Yes | 9.0 | 3.0 | 4 | 10.5 |
Here is an Example of Array reduce() method:
<html>
<body>
<p id="reduce"></p>
<script>
var x = [400, 150, 45];
document.getElementById("reduce").innerHTML = x.reduce(myReduced);
function myReduced(total, num)
{
return total - num;
}
</script>
</body>
</html>
Output:
Example 2:
<html>
<head>
<title> JavaScript Array reduce() Method </title>
</head>
<body>
<button onclick="myphp()"> Click Here! </button>
<br><br>
Sum: <span id="Reduce1"></span>
<script>
var a = [1.85, 15.3, 18.3, 35.9];
function sumofArray(sum, num)
{
return sum + Math.round(num);
}
function myphp(item)
{
document.getElementById("Reduce1").innerHTML = a.reduce(sumofArray, 0);
}
</script>
</body>
</html>
Output:
Sum:
Sum:
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