Difference between each and map in jquery

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In this video we will discuss the difference between each and map functions in jquery
$.map
map method can be used as an iterator.
Returns a new array.
The order of callback arguments - element, index.
$.map(elems, function () { element, index }, arg)
Does not have a way to terminate the iteration
$.each
each method is an immutable iterator.
Returns the original array.
The order of callback arguments - index, element
$.each(elems, function () { index, element }, arg)
return false to terminate the iteration
Example : Notice that the callback arguments in the each method are the reverse of the callback arguments in the map function. Also notice that map returns a new array where as each method returns the original array. This proves the point that each method is an immutable iterator where as map is not.
$(document).ready(function () {
var intArray = [1, 2, 3, 4, 5];
function functionA(index, element) {
return element * 5;
}
function functionB(element, index) {
return element * 5;
}
var result1 = $.each(intArray, functionA);
var result2 = $.map(intArray, functionB);
document.write('each = ' + result1);
document.write('<br/>')
document.write('map = ' + result2);
});
Example : Notice that each method terminates the iteration when the element value is 3. The values 3, 4 and 5 are not written to the document. With map method we are not able to break the iteration. When the element value is 3, map method returns false and then continues writing 4 and 5 to the document.
$(document).ready(function () {
var intArray = [1, 2, 3, 4, 5];
$.each(intArray, function (index, element) {
if (element == 3)
return false;
document.write(element + ',');
});
document.write('<br/>');
$.map(intArray, function (element, index) {
if (element == 3)
return false;
document.write(element + ',');
});
});

[@toan6375]

This is the best awesome lecture I've seen. Thank you so much Venkat!!!

[@nguaial8490]

Thank you. You are the best!!!

[@NoahNobody]

Is it just me, or is it bad form that $.each() didn't throw some kind of warning when it didn't multiply the value inside the function?

[@maniktk145]

ur videos r amazing.pls upload more about json..

[@yuglearnings5046]

Map method is working fine with me but when I have tried giving argument B in each method, output doesn't get chanced. var result1 = $.each(intArray, functionB); Does it mean that each method callback function can take any order .. this is my full code. var intArray = [4, 6, 2, 10, 8];
function functionA(index, element) {
return element * 5;
}
function functionB(element, index) {
return element * 5;
}
var result1 = $.each(intArray, functionB);
var result2 = $.map(intArray, functionB);
document.write('each = ' + result1);
document.write('')
document.write('map = ' + result2);

[@daelysianfields]

I am lil bit confused with this. Correct me if I am wrong.. Just like $.each() and $().each there are $.map() and $(). both the each function takes callback in the form of function(index, element){} but $().map takes function(index, element){} while $.map() takes in the form of function(element, index){}...
maybe you should have included difference between maps in Part 26 difference between each video.

[@gowthambhat1498]

thanks man

[@developernader]

Thank you for your efforts wonderful

[@rahulsrivastava4228]

thank you sir

[@mryoutuser]

Thanks sir,
using document.write inside document.ready event is destroying the document contents in FireFox , so is there a solution for it ?

[@lawviktor7610]

Hi, what should i do if i want to write the result1 and result2 into a div? Thank you~

[@barshalamichhane6761]

you can make id in div element . and call that. for eg $("#divid").html('each= '+ result1);

[@NikitaArtBucket]

Thanks Sir, Please upload video related to ajax implementation through jquery.

[@Csharp-video-tutorialsBlogspot]

Jyotirmaya Das You are very welcome. Sure, I will record and upload as soon as I can. Thank you very much for your patience.
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[@ahammedshibil7355]

can we give any name to function paramiters