filter

Describing the filter Operation

• filter is used for filtering an array based on a condition

• It accepts a callback function with the following arguments:

  • currentValue: Current element processed in the array
  • index: Optional index of currentValue
  • array: Optional array that is called
  • thisArg: Optional value to use as this

Defining an Array

let fruits = ["Apple", "Banana"];
console.log(fruits.length);
// 2

Using the filter Operation

// Regular function
fruits.filter(function(item, index, array) {
    return item.length > 5;
})
// Array["Banana"]

// Arrow function
fruits.filter(item => item.length > 5);
// Array["Banana"]