Checks if value is exactly null. Part of Lodash Lang (stable — not deprecated). Note: same as value === null — undefined returns false. Use _.isNil when both should match.
Pass the value you want to inspect or convert. Read the return type carefully before you use the result.
Call _.isNull. Start with this line.
_.isNull(value)| Call | What it does |
|---|---|
_.isNull(value) | Primary signature. |
Prefer import isNull from "lodash/isNull" when you want a smaller bundle.
_.isNull(value)| Parameter | Description |
|---|---|
| value | Required. Value to check |
| Return Value | Description |
|---|---|
| * | true if value is null, else false |
null vs undefinedOnly the null primitive returns true.
console.log(_.isNull(null)); // true
console.log(_.isNull(void 0)); // falsetrue.undefined → false.undefined._.isNil.isNull vs isNilSee how the two helpers disagree on undefined.
console.log(_.isNull(null)); // true
console.log(_.isNil(null)); // true
console.log(_.isNull(undefined)); // false
console.log(_.isNil(undefined)); // trueisNull and isNil agree → true.isNull rejects; isNil accepts.isNull; any missing → isNil.value == null behaves like isNil, not isNull.nullKeep 0, empty string, and false as present values.
console.log(_.isNull(0)); // false
console.log(_.isNull("")); // false
console.log(_.isNull(false)); // false
console.log(_.isNull(NaN)); // falsenull primitive.false.=== null succeeds.!value when you mean “is null.”Object.create(null) Is Not nullA dictionary object with a null prototype is still an object.
var dict = Object.create(null);
console.log(_.isNull(dict)); // false
console.log(Object.getPrototypeOf(dict) === null); // trueObject.create(null) builds a plain object.false.null — different question.null DifferentlyModel APIs that clear a field with null but leave others unset.
function statusOf(nickname) {
if (_.isNull(nickname)) {
return "cleared";
}
if (_.isUndefined(nickname)) {
return "not set";
}
return "set: " + nickname;
}
console.log(statusOf(null)); // cleared
console.log(statusOf(undefined)); // not set
console.log(statusOf("Ada")); // set: Ada"cleared"."not set".isNil would lose that distinction._.isNull is a Lodash Lang helper available in 4.x (and earlier 3.x builds). It runs anywhere Lodash runs — modern browsers (via CDN or bundle) and Node.js / Bun / Deno with npm install lodash. Native engines express the same idea with value === null, but not this helper by name.
Available in [email protected] full builds and the lodash/isNull modular import. Works in evergreen browsers and current Node LTS when Lodash is installed.
Bottom line: Safe for production once Lodash is on the page or in your bundle. Prefer import isNull from "lodash/isNull" for smaller builds. Equivalent to value === null as a named function.
Check whether a value is classified as a number.
10 people found this page helpful