arrays

class overview

Homework Solution
Adding & Removing
Array.filter()
Array.map()
Views Exercise
Homework Overview

ADDING & REMOVING

Add items to the end of an array with Array.push(value)
Remove an item by using it's index and Array.splice(index, howMany)

 var arr = [];
 arr.push("trot");
 arr.push("prance");
 arr.push("jog");
//['trot', 'prance', 'jog']
//remove prance
 arr.splice(1, 1);
//['trot', 'jog']

Array.push() documentation

Array.splice() documentation

ARRAY.FILTER()

Creates a new array filtered by a custom criteria
First argument is a function to test each element. Returning true will include that element in that result.

//gets even numbers 
[1,2,3,4,5].filter(function(value, index, arr) {
     return value % 2 == 0;
 });

//[2,4]

Array.filter() documentation

ARRAY.MAP()

Creates a new array by calling the provided function on each value.
First argument is the function to be called.

//add 5 to each number
[1,2,3,4,5].map(function(curVal, index, arr) {
     return curVal + 5;
});
//[6,7,8,9,10]

Array.map() documentation

views exercise

Make a page with multiple views
Navigation should be via JavaScript

cool js thing for the day

Open API's

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arrays

class overview

ADDING & REMOVING

ARRAY.FILTER()

ARRAY.MAP()

views exercise

cool js thing for the day