I see the example that creates an array using
var array = new Array(5);
but also I see something like this
arrayObj[0] = "index zero";
arrayObj[10] = "index ten";
I think the above code creates an object with two field name 0 and 10 like below? Is that correct?
arrayobj {
0: "index zero"
10: "index ten"
}
any different in this two way to create array using new Array() and new Object ?
Array and Object are different from eachother. Technically what you are doing makes the data structure and utility for time being as same but you miss on prototype functions and cannot use it crossside.
E.g Array.forEach() will loop on an array but it will not loop on an object whose key/value pair are equivalent to that of index/item of an array
var array = new Array(5).fill('index');
arrayObj = {};
arrayObj[0] = "index zero";
arrayObj[10] = "index ten";
try {
console.log(array.length);
array.forEach(i => console.log(i));
console.log(arrayObj.length);
arrayObj.forEach(i => console.log(i));
} catch (e) { console.error(e); }
//looping over Object
Object.keys(arrayObj).forEach((item)=>{
console.log(arrayObj[item]);
});
Object.keys(arrayObj).length to get the length however using arrayObj.length directly will return undefined
var arrayObj = []; arrayObj[0] = "index zero"; arrayObj[10] = "index ten"; console.log(arrayObj)/var arrayObj = {}; arrayObj[0] = "index zero"; arrayObj[10] = "index ten"; console.log(arrayObj)new Array(5);- this will create a sparse array with onlylengthproperty and no array elements.