Apply a function to two values of an array simultaneously from left to right using the reduce() method in JavaScript to reduce them to a single value.
The following are the parameters -
You can try running the following code to learn how to use the reduce() method in JavaScript -
<html> <head> <title>JavaScript Array reduce Method</title> </head> <body> <script> if (!Array.prototype.reduce) { Array.prototype.reduce = function(fun /*, initial*/) { var len = this.length; if (typeof fun != "function") throw new TypeError(); // no value to return if no initial value and an empty array if (len == 0 && arguments.length == 1) throw new TypeError(); var i = 0; 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 >= len) throw new TypeError(); } while (true); } for (; i < len; i++) { if (i in this) rv = fun.call(null, rv, this[i], i, this); } return rv; }; } var total = [0, 1, 2, 3].reduce(function(a, b){ return a + b; }); document.write("total is : " + total ); </script> </body> </html>
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