More Array Methods

Developer
Martin Baillie
Size
2,327 Kb
Views
2,023
  1. More Array Methods Previews
  2. More Array Methods HTML Codes
  3. More Array Methods JS Codes

How do I make an more array methods?

What is a more array methods? How do you make a more array methods? This script and codes were developed by Martin Baillie on 25 January 2023, Wednesday.

More Array Methods Previews
IQ Test

More Array Methods - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>More Array Methods</title>
</head>
<body> <script src="js/index.js"></script>
</body>
</html>

More Array Methods - Script Codes JS Codes

'use strict';
/*
Array.isArray(obj)
var new_arr = arr.concat(value1[, value2[, ...[, valueN]]])
var boolean = arr.every(function(currentValue[, index[, array])[, thisArg])
var arr = arr.fill(value[, start = 0[, end = this.length]])
var new_arr = arr.filter(function(element[, index[, array])[, thisArg])
var value || undefined = arr.find(function(element[, index[, array])[, thisArg])
*/
var cl = console.log;
console.clear();
var a = [1,2,3,4,5];
var b;
var c;
var d;
var obj = {};
cl('a.length', a.length);
cl('b = a.slice() new arr', b = a.slice());
cl('b', b);
cl('a', a)
cl('a.pop() el removed', a.pop())
cl('a', a);
cl('b', b)
cl('a.push(el,..) length', a.push(5,6));
cl('a', a);
cl('a.shift() el removed', a.shift())
cl('a', a)
cl('a.unshift(el,..) length', a.unshift(1));
cl('a', a);
cl('a.forEach(function (item, index, array) { ... }, thisArg) returns undefined', a.forEach(function (item, index, array) { this['index' + index] = item; }, obj)
);
cl('Result of forEach()', obj);
cl('a.find(function (item, index, array) { ... }, thisArg) returns item', a.find( function ( item, index, array) { return item === 3; }, obj)
);
cl('a.every(function ( item, index, array) { ... }, thisArg) returns boolean', a.every(function (item, index, array) { return item < 10; }, obj)
);
cl('a.filter(function ( item, index, array) { ... }, thisArg) returns array', a.filter(function(item, index, array) { return item >= 3; }, obj)
);
cl('a.findIndex(function ( item, index, array ) { ... }, thisArg) returns index', a.findIndex(function(item, index, array) { return item === 3; }, obj)
);
d = [1,4,9];
cl('a.map(function ( item, index, array ) { ... }, thisArg) returns new array', d.map(Math.sqrt), d.map(function( item, index, array ) { return item * 2; }, obj ), d
);
c = [3,2,1,5,4];
cl('a.sort([function(a,b)]) returns new array (modifies array)', c.sort(function(x,y) { return x - y}), // callback function required for numbers c.sort( (x, y ) => x - y ), c
);
cl('a.reduce(function( previousValue, currentValue, currentIndex, array } { ... }, initialValue) returns reduction value)', a.reduce( function (previousValue, currentValue, currentIndex, array ) { return previousValue - currentValue; }), a.reduce( (prev, curr, i, arr) => prev - curr)
);
cl('a.reduceRight(function( previousValue, currentValue, currentIndex, array } { ... }, initialValue) returns reduction value)', a.reduceRight( function (previousValue, currentValue, currentIndex, array ) { return previousValue - currentValue; }), a.reduceRight( (prev, curr, i, arr) => prev - curr)
);
cl('a.reverse() returns new array (modifies array)', a.reverse());
cl('a.toString() returns comma separated string', a.toString());
cl('a.join(separator = \',\') returns string', a.join(), a.join('|'), a.join(', '), a.join('')
);
cl('a.indexOf(el[, fromIndex]) index || -1', a.indexOf(2, 2));
cl('a.lastIndexOf(searchElement[, fromIndex = arr.length - 1]) returns index || -1', a.lastIndexOf(5, a.length-2)
);
cl('a.includes(searchElement[, fromIndex]) returns boolean', a.includes(5,1)
);
b = a.slice();
cl('a.splice(start, deleteCount[, item1[, item2[, ...]]]) returns deleted elements (modifies array)', b.splice(0, 2, 8, 9), b
);
cl('a.fill(value[, start = 0[, end = this.length]]) returns modified array (modifies array)', a.fill(5, 1, a.length - 1), Array(3).fill(4)
);
More Array Methods - Script Codes
More Array Methods - Script Codes
Home Page Home
Developer Martin Baillie
Username martin42
Uploaded January 25, 2023
Rating 3
Size 2,327 Kb
Views 2,023
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