The reduce() method executes a reducer function for array element. The reduce() method returns a single value: the function's accumulated result. The reduce() method does not execute the function for empty array elements.

ES5 lets you define object methods with a syntax that looks like getting or setting a property. This example creates a getter for a property called fullName:

The toFixed() method converts a number to a string. The toFixed() method rounds the string to a specified number of decimals.

The slice() method creates a new array. The slice() method does not remove any elements from the source array.

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const myPromise = new Promise(function(myResolve, myReject) { setTimeout(function() { myResolve("I love You !!"); }, 3000);}); myPromise.then(function(value) { document.getElementById("demo").innerHTML = value;});

The reduce() method runs a function on each array element to produce (reduce it to) a single value. The reduce() method works from left-to-right in the array. See also reduceRight() .

map() creates a new array from calling a function for every array element. map() does not execute the function for empty elements. map() does not change the original array.

The array_reduce() function sends the values in an array to a user-defined function, and returns a string. Note: If the array is empty and initial is not passed, this function returns NULL.

The entries() method returns an Iterator object with the key/value pairs from an array: [0, "Banana"] [1, "Orange"] [2, "Apple"] [3, "Mango"] The entries() method does not change the original array.