Tag: javascript

const xhr = new XMLHttpRequest(); const url = “END_POINT”; const data = {};//Request Body xhr.open(“POST”, url, true); xhr.setRequestHeader(“Content-Type”, “application/json”); xhr.onreadystatechange = function () {     if (xhr.readyState === 4 && xhr.status === 200) {         console.log(xhr.responseText);     } }; xhr.send(data);

The problem If you’ve been using the fetch() function in the browser or modern versions of Node.js, you know that it returns a Promise. 1fetch(request).then((response) => { 2 // Handle the response. 3}) You also know that promises in JavaScript reject if there’s been an error while resolving them. But, for some obscure reason, the Promise returned from fetch() never rejects… Continue reading Why Fetch Promise Doesn’t Reject on Error Responses

Object.keys() returns an array whose elements are strings corresponding to the enumerable string-keyed property names found directly upon object. This is the same as iterating with a for…in loop, except that a for…in loop enumerates properties in the prototype chain as well. The order of the array returned by Object.keys() is the same as that… Continue reading Object.keys

Function to find the total from an array of object if it contains similar items. var groupedByItem = arr.reduce(function (result, current) {    var item = current.Item;    if (!result[item]) {       result[item] = {          Type: current.Type,          Item: item,          TotalQuantity: 0       };    }    result[item].TotalQuantity += parseInt(current.Quantity);    return result;… Continue reading Calculate total from an array of object contains similar items.