How to use the isNull function from underscore

Find comprehensive JavaScript underscore.isNull code examples handpicked from public code repositorys.

_.isNull is a function in Underscore.js library that checks whether a given value is null or not.

index.js

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var Transaction = require('ethereumjs-tx').Transaction;
var Common = require('ethereumjs-common').default;




var isNot = function(value) {
    return (_.isUndefined(value) || _.isNull(value));
};


var Accounts = function Accounts() {
    var _this = this;

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+ 3 other calls in file

How does underscore.isNull work?

The isNull function in Underscore.js is a simple utility function that returns true if the value passed to it is null, and false otherwise. It checks the value strictly for null, meaning that only the null value will return true, while undefined, false, 0, and an empty string will all return false.

Ai Example

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const _ = require("underscore");

console.log(_.isNull(null)); // true
console.log(_.isNull(undefined)); // false
console.log(_.isNull(0)); // false
console.log(_.isNull("")); // false
console.log(_.isNull(false)); // false

In the example above, _.isNull() is used to check whether a value is null or not. It returns true if the value is null and false otherwise.

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