IndexOf an associative array in javascript

Question

can someone tell me please how to get index of an associative array??

for example index of key:".launchPad-plankovy"??

 var droppableClasses = [
 {key:".stackDrop-plankovy", value:".card-plankovy"}, 
 {key:".launchPad-plankovy", value:".card-plankovy"}
 ];

Answer 1

With ES6 you can use findIndex() like this.

var droppableClasses = [{
 key: ".stackDrop-plankovy",
 value: ".card-plankovy"
}, {
 key: ".launchPad-plankovy",
 value: ".card-plankovy"
}];
var index = droppableClasses.findIndex(function(e) {
 return e.key == '.launchPad-plankovy';
})
console.log(index)