JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = ['orange', 'red', 'black', 'white'];

document.write('before: ' + JSON.stringify(arr) + '<hr>');

arr.deleteElem = function ( val ) {
    var new_arr = [];
    for ( var i = 0; i < this.length; i++ ) {
        if ( this[i] !== val ) {
            new_arr.push(this[i]);
        }
    }
    return new_arr;
};

arr = arr.deleteElem( 'red' );

document.write('after: ' + JSON.stringify(arr));