let's make a reduce() function of Allay class using javascript prototype.
Array.prototype.myReduce = function(callback, initVal) {
let acc = initVal;
for (i = 0; i < this.length; i++) {
acc = callback(acc, this[i]);
};
return acc
}
let myArray = [1,2,3]
myArray.myReduce((acc, elem) => { return acc + elem; }, 0)
6
What is reduce() function
from mozira document of reduceThe
reduce()
method executes a reducer function (that you provide) on each element of the array, resulting in a single output value.const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;
// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10
// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15
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