The function also using closure. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures

i am glad it did.

coding part

Thanks for the reply, i will look into it.

but both functions are returning undefined on chrome's console.

http://www.xeditor.com

i've dashboard & document tab. when user goes to document tab, it loads a tree and when user clicks on the element of tree, an ajax request is made to load the necessary data from server & it takes some time to load the content. in the mean while if user switch to dashboard tab, i want all the operations from document tab to stop & stop loading data into DOM.

Thanks.

var a = [ 2 , 3 , 2 , 4 ]; var b = a.map( function ( e, i, a ) { return multiply(i, a); }); function multiply ( _i, a ) { var sum = 1 ; a.forEach( function ( e, i ) { if (_i === i) return ; sum = sum * e; }) return sum; } console .log(b);

var users = [ 1 , 1 , 4 , 4 , 5 ]; var unique = {}; users.forEach(x => unique[x] = x); console .log( Object .keys(unique));