I am new to JavaScript and struggling with how to extract data from this array. Can you confirm if it is formatted correctly? Shown below is the console output of the array object:
[]
0: Item {id: 0, symbol: "VBIV", boughtDate: "2018-07-22", company: "VBI Vaccines Inc."}
1: Item {id: 1, symbol: "R", boughtDate: "2018-07-22", company: "Ryder System Inc."}
2: Item {id: 2, symbol: "R", boughtDate: "2018-07-22", company: "Ryder System Inc."}
length: 3
__proto__: Array(0)
To access a specific object in an array, you can utilize the index by using array[index].
If you are unaware of the index but know the id, you can use:
array.find(element => element.id === id)
To illustrate, consider the scenario where I aim to retrieve the company name associated with id:2.
In order to obtain this information, you need to access the object located at index 2 within the array by using square brackets [], and then extract the id property from that object using the dot . notation.
console(myArray[2].id) //=> 2
console(myArray[2].company) //=> "Ryder System Inc."
Alternatively, you can assign the object retrieved from the array to a variable and then access its properties:
var myObj = myArray[2]
console(myObj.id) //=> 2
console(myObj.company) //=> "Ryder System Inc."
I am pleased to learn if this can be optimized compared to the current method and tailored to your specific requirements.
Array.prototype.findKey = function(key, value, start = 0, revert = false, restart = true) {
let __forward = function(index, limit, array, key, value) {
let ele = null;
while (index < limit && (ele = array[index])[key] !== value) index++;
return {index: index, value: ele};
},
__backward =function(index, limit, array, key, value) {
let ele = null;
while (index > limit && (ele = array[index])[key] !== value) index--;
return {index: index, value: ele};
};
if (!(typeof key !== "string" || start < 0 || !(start < this.length) || typeof this[0] !== "object")) {
let length = this.length, result;
/* no revert: forward direction, until first match */
if (!revert) {
result = __forward(start, length, this, key, value);
if (result.index < length)
return result;
else if (restart && start > 0) {
result = __forward(0, start, this, key, value);
if (result.index < start)
return result;
}
} else {
/* revert: backward direction, until last match */
result = __backward(start, -1, this, key, value);
if (result.index > -1)
return result;
else if (restart && start < length-1) {
result = __backward(length-1, start, this, key, value, true);
if (result.index > start)
return result;
}
}
}
return {index: -1, value: null};
}
usage:
let a = [{id: 1, value: "rock"}, {id: 2, value: "roll"}, ...];
let item2 = a.findKey("id", 2, a.length-1, true),
val2 = item2.value,
idx2 = item2.index;
let item1 = a.findKey("id", 1, idx2 - 1, true),
val1 = item1.value,
idx1 = item1.index;
etc...
As a regular function:
window.OO7array_findKey = function(key, value, start = 0, revert = false, restart = true) {
/* same as above script, dont worry feel free to copy and paste here */
};
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