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nullish coalescing operator javaScript

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Aditya Pratap Singh answered on September 14, 2021 Popularity 10/10 Helpfulness 5/10

answer nullish coalescing operator javaScript

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nullish coalescing operator javaScript

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// The nullish coalescing operator (??) provides a concise way to 
// assign a default value to a variable if the variable is null or undefined.
// (??) considers values that are not null or undefined as truthy. 
const res1 = undefined ?? 'Default'; // res7: 'Default'
const res2 = null ?? 'Default'; // res1: 'Default'
const res3 = NaN ?? 'Default';  // res3: 'Default'
const res4 = false ?? 'Default';// res5: false
const res5 = true ?? 'Default'; // res7: true
const res6 = '' ?? 'Default';   // res2: ''
const res7 = {} ?? 'Default';   // res6: {}
const res8 = 0 ?? 'Default';    // res4: 0

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript nullish-coalescing

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Contributed on Jun 15 2023

Aditya Pratap Singh

0 Answers Avg Quality 2/10

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nullish coalescing js

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The nullish coalescing operator ( ?? ) is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined , and otherwise returns its left-hand side operand

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 14 2021

Crowded Copperhead

0 Answers Avg Quality 2/10

nullish coalescing operator in javascript

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//nullish coalescing operator in js
Expression:
	Left ?? Right
if left is null or undefined , then Right will be the value

let value = null ?? "Oops.. null or undefined";
console.log(value) //Oops.. null or undefined

value = undefined ?? "Oops.. null or undefined";
console.log(value) //Oops.. null or undefined

value = 25 ?? "Oops.. null or undefined";
console.log(value) // 25

value = "" ?? "Oops.. null or undefined";
console.log(value) // ""

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 26 2022

coder_king

0 Answers Avg Quality 2/10

js nullish coalescing ?? vs logical or ||

Comment

The OR operator || uses the right value if left is falsy 
(e.g. "" or 0 or false), while the nullish coalescing operator ?? uses
the right value if left is null or undefined.

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.chttps

Tags: javascript j

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Contributed on Oct 19 2022

Stupid Scarab

0 Answers Avg Quality 2/10

coalescing operator javascript

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/* The coalescing operator is very nice to use with the optional chaining
for setting a default value. Thus, you could use the code below to fall
back on a default phone number which is an empty string */

const contactInfos = { address: "20B Rue Lafayette" };
console.warn(contactInfos.user?.phoneNumber ?? "")
// ""

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: coalescing c

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Contributed on Jan 02 2023

Mehedi Islam Ripon

0 Answers Avg Quality 2/10

javascript null coalescing

Comment

const value = null ?? 'Default Value';
console.log(value);  // Output: 'Default Value'

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: Grepper

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

nullish coalescing operator js

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const defaultValue = 'Default Value';
const value1 = null;
const value2 = undefined;
const value3 = 'Actual Value';

console.log(value1 ?? defaultValue); // Output: Default Value
console.log(value2 ?? defaultValue); // Output: Default Value
console.log(value3 ?? defaultValue); // Output: Actual Value

Popularity 8/10 Helpfulness 1/10 Language javascript

Source: Grepper

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Contributed on Sep 11 2023

YOU.com

0 Answers Avg Quality 2/10

nullish coalescing operator javaScript

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