Remove All Elements from Array That Do Not Start With a Certain String

Remove all elements from array that do not start with a certain string

Modification to erisco's Functional approach,

array_filter($signatureData[0]["foo-"], function($k) {
    return strpos($k, 'foo-abc') === 0;
}, ARRAY_FILTER_USE_KEY);

this worked for me.

remove all items in array that start with a particular string

Simply use Array.filter:

arr = arr.filter(function (item) {
   return item.indexOf("ftp_") !== 0;
});

Edit: for IE9- support you may use jQuery.grep:

arr = $.grep(arr, function (item) {
   return item.indexOf("ftp_") !== 0;
});

Remove all elements from array of strings that do not contain IN

You can use ES5 filter method:

arr = arr.filter(function(s){
    return ~s.indexOf("IN");
});

And using ES6 arrow functions, it can be simplified to:

arr = arr.filter(s=>~s.indexOf("IN"));

Remove all elements from array that match specific string

Simply use the Array.prototype.filter() function for obtain elements of a condition

var array = [1,2,'deleted',4,5,'deleted',6,7];
var newarr = array.filter(function(a){return a !== 'deleted'})

Update: ES6 Syntax

let array = [1,2,'deleted',4,5,'deleted',6,7]
let newarr = array.filter(a => a !== 'deleted')

How to remove all element from array except the first one in javascript

You can set the length property of the array.

var input = ['a','b','c','d','e','f'];  

input.length = 1;

console.log(input);

Javascript array search and remove string?

I'm actually updating this thread with a more recent 1-line solution:

let arr = ['A', 'B', 'C'];
arr = arr.filter(e => e !== 'B'); // will return ['A', 'C']

The idea is basically to filter the array by selecting all elements different to the element you want to remove.

Note: will remove all occurrences.

EDIT:

If you want to remove only the first occurence:

t = ['A', 'B', 'C', 'B'];
t.splice(t.indexOf('B'), 1); // will return ['B'] and t is now equal to ['A', 'C', 'B']

Remove all matching elements from array

Use Array.prototype.filter, and check that it doesn't include "lol":

const result = ["onelolone","twololtwo","three"].filter(ele => !ele.includes("lol"))

console.log(result)// ["three"]

How to remove all element after a specific element of array?

You can do this easily using indexOf and slice methods of array in javascript.

var arr = ["AAA", "BBB", "CCC", "AAA", "BBB", "CCC", "AAA", "BBB", "CCC", "DDD"];
var firstElem = arr[0];
var secondIndex = arr.indexOf(firstElem, 1);

// Output: ["AAA", "BBB", "CCC"]
var newArr = (secondIndex != -1) ? arr.slice(0, secondIndex) : arr;

Working Fiddle: https://jsfiddle.net/4f25wyaj/2/

Remove All Elements from Array That Do Not Start With a Certain String