Simple asynchronous ForEach integration for Javascript without async/await or libraries.

async-foreach.js

function forEachOf(items, callback, finishCallback) {
    if (items.length !== undefined && items.length > 0) {
        this.key = this.key || 0;
        if (this.key >= items.length){
            this.key = 0;
            finishCallback();
        }else {
            callback(items[this.key], this.key, () => {
                this.key++;
                forEachOf(items, callback, finishCallback);
            });
        }
    } else {
        finishCallback();
    }
}

try-async-foreach.js

/**
* You can use it with Jquery or simple Array [0, 2 ,3]
* _this: mean the current the element
* key: the current element index
* callbackForNext: trigger the next item in the foreEach
**/
forEachOf($(selector), (_this, key, callbackForNext) => {
    // Example with Timeout
    setTimeout(()=>{
        // Put Your asyn code Here Example
        callbackForNext();
    }, 2000); // Wait 2 Seconds and continue to next item

}, () => {
    // This function is called when all the items were iterated
});