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How to apply a function simultaneously against two values of the array from right-to-left?
Use the reduceRight() method in JavaScript to apply a function simultaneously against two values of the array from right-to-left as to reduce it to a single value.
The following are the parameters −
- callback − Function to execute on each value in the array.
- initialValue − Object to use as the first argument to the first call of the callback
Example
You can try to run the following code to learn how to work with reduceRight() method in JavaScript −
<html>
<head>
<title>JavaScript Array reduceRight Method</title>
</head>
<body>
<script>
if (!Array.prototype.reduceRight)
{
Array.prototype.reduceRight = function(fun /*, initial*/)
{
var len = this.length;
if (typeof fun != "function")
throw new TypeError();
// no value to return if no initial value, empty array
if (len == 0 && arguments.length == 1)
throw new TypeError();
var i = len - 1;
if (arguments.length >= 2)
{
var rv = arguments[1];
} else {
do
{
if (i in this)
{
rv = this[i--];
break;
}
// if array contains no values, no initial value to return
if (--i < 0)
throw new TypeError();
}
while (true);
}
for (; i >= 0; i--)
{
if (i in this)
rv = fun.call(null, rv, this[i], i, this);
}
return rv;
};
}
var total = [0, 1, 2, 3].reduceRight(function(a, b) { return a + b; });
document.write("total is : " + total );
</script>
</body>
</html>
Updated on: 23-Jun-2020
43 Views
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