javascript test for existence of nested object key and assign it

javascriptnested.md

Sometimes you need to check for a nested object value and assign it if it exists.

Please note the following ugly code.

var assign_to_this;
if(test.level1 && test.level1.level2 && test.level1.level2.level3) {
    assign_to_this = test.level1.level2.level3;
}

Can be re-writen in a minmalistic way.

var assign_to_this = (((test || {}).level1 || {}).level2 || {}).level3;