every

Describing the every Operation

• The every operation is used for testing if every element of an array satisfies 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 every Operation

// Regular function
fruits.every(function(item, index, array) {
    return item.length > 10;
})
// false

// Arrow function
fruits.every(item => item.length > 2);
// true