TypeScript forEach() Loop

We will introduce how to use the forEach() loop and discuss its advantages and disadvantages.

the forEach() Loop in TypeScript

There are many situations in which we may need to iterate through arrays and perform some functions on each element of that array. In TypeScript, we can use some loops for this function.

The forEach() loop can be used to iterate through an array. We will use this loop to iterate each item in an array.

We can also use it in TypeScript data types, for example, Arrays, Maps, Sets. etc. This method helps arrange elements in an array.

Syntax:

The forEach() loop is mentioned below.

array.forEach(callback[, thisObject]);

The forEach() loop is executed to provide the callback one time for each presented element according to ascending order in an array.

Parameter Details

A callback is a function used to evaluate every element. This function of the callback is discussed in the three arguments below.

1. The Element Value is the value of the currently used item.
2. The Element index is the current element of the index in an array that is processed.
3. An Array is a method in the being of the iterated in forEach().

thisObject is to be used when we have to execute the callback method.

Return Value

The created array will be returned.

let Brands = ['Iphone', 'Samsung', 'Huawei'];
let Store: any[] = [];

Brands.forEach(function(item){
  Store.push(item)
});

console.log(Store);

Output:

Example with number:

var quantity = [5, 10, 15];
quantity.forEach(function (stock) {
  console.log(stock);
});

Output:

the Advantages of forEach() in TypeScript

This is only one advantage mentioned here, as given below.

1. It is a more up-to-date way with lesser code to emphasize an array.
2. An Iterator, index of the item, and array to iterate are its parameters.

the Disadvantages of forEach() in TypeScript

1. It is slower than the conventional circle in execution.
2. The break statement can’t be utilized due to the callback function.
3. The keyword can’t be used in the callback function, and it may go toward the incorrect result.