Remove Object from Array using JavaScript
You can use several methods to remove item(s) from an Array:
//1
someArray.shift(); // first element removed
//2
someArray = someArray.slice(1); // first element removed
//3
someArray.splice(0, 1); // first element removed
//4
someArray.pop(); // last element removed
//5
someArray = someArray.slice(0, someArray.length - 1); // last element removed
//6
someArray.length = someArray.length - 1; // last element removed
If you want to remove element at position x, use:
someArray.splice(x, 1);
Or
someArray = someArray.slice(0, x).concat(someArray.slice(-x));
Reply to the comment of @chill182: you can remove one or more elements from an array using Array.filter, or Array.splice combined with Array.findIndex (see MDN).
See this Stackblitz project or the snippet below:
// non destructive filter > noJohn = John removed, but someArray will not change
let someArray = getArray();
let noJohn = someArray.filter( el => el.name !== "John" );
log(`let noJohn = someArray.filter( el => el.name !== "John")`,
`non destructive filter [noJohn] =`, format(noJohn));
log(`**someArray.length ${someArray.length}`);
// destructive filter/reassign John removed > someArray2 =
let someArray2 = getArray();
someArray2 = someArray2.filter( el => el.name !== "John" );
log("",
`someArray2 = someArray2.filter( el => el.name !== "John" )`,
`destructive filter/reassign John removed [someArray2] =`,
format(someArray2));
log(`**someArray2.length after filter ${someArray2.length}`);
// destructive splice /w findIndex Brian remains > someArray3 =
let someArray3 = getArray();
someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1);
someArray3.splice(someArray3.findIndex(v => v.name === "John"), 1);
log("",
`someArray3.splice(someArray3.findIndex(v => v.name === "Kristian"), 1),`,
`destructive splice /w findIndex Brian remains [someArray3] =`,
format(someArray3));
log(`**someArray3.length after splice ${someArray3.length}`);
// if you're not sure about the contents of your array,
// you should check the results of findIndex first
let someArray4 = getArray();
const indx = someArray4.findIndex(v => v.name === "Michael");
someArray4.splice(indx, indx >= 0 ? 1 : 0);
log("", `someArray4.splice(indx, indx >= 0 ? 1 : 0)`,
`check findIndex result first [someArray4] = (nothing is removed)`,
format(someArray4));
log(`**someArray4.length (should still be 3) ${someArray4.length}`);
// -- helpers --
function format(obj) {
return JSON.stringify(obj, null, " ");
}
function log(...txt) {
document.querySelector("pre").textContent += `${txt.join("\n")}\n`
}
function getArray() {
return [ {name: "Kristian", lines: "2,5,10"},
{name: "John", lines: "1,19,26,96"},
{name: "Brian", lines: "3,9,62,36"} ];
}<pre>
**Results**
</pre>The clean solution would be to use Array.filter:
var filtered = someArray.filter(function(el) { return el.Name != "Kristian"; });
The problem with this is that it does not work on IE < 9. However, you can include code from a Javascript library (e.g. underscore.js) that implements this for any browser.