AlgoDaily Solution
1Array.prototype.myReduce = function (callback, initialValue) {
2 const argsLength = arguments.length;
3 //If array is empty and there is no initial value, return an error
4 if (argsLength === 1 && this.length === 0) {
5 throw new Error();
6 }
7
8 let index = argsLength === 1 ? 1 : 0;
9 let resultValue = argsLength === 1 ? this[0] : initialValue;
10
11 //Call the callback function for every element and replace the resultValue
12 for (let i = index; i < this.length; i += 1) {
13 resultValue = callback(resultValue, this[i], i, this);
14 }
15
16 return resultValue;
17};Community Solutions
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Array.prototype.myReduce = function (callback, initialValue) { const argsLength = arguments.length; //If array is empty and there is no initial value, return an error if (argsLength === 1 && this.length === 0) { throw new Error(); } let index = argsLength === 1 ? 1 : 0; let resultValue = argsLength === 1 ? this[0] : initialValue; //Call the callback function for every element and replace the resultValue for (let i = index; i < this.length; i += 1) { resultValue = callback(resultValue, this[i], i, this); } return resultValue;};OUTPUT
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