Checks if value is strictly less than other. Part of Lodash Lang since 3.9.0 (stable — not deprecated). Note: equal values return false — use _.lte for less-or-equal.
Pass the value you want to inspect or convert. Read the return type carefully before you use the result.
Call _.lt. Start with this line.
_.lt(value, other)| Call | What it does |
|---|---|
_.lt(value, other) | Primary signature. |
_.lt(value) | Check, compare, clone, or convert a value. |
Prefer import lt from "lodash/lt" when you want a smaller bundle.
_.lt(value, other)| Parameter | Description |
|---|---|
| value | Required. Left-hand value to compare |
| other | Required. Right-hand value to compare |
| Return Value | Description |
|---|---|
| * | true if value < other, else false |
Strict less-than for three classic pairs.
console.log(_.lt(1, 3)); // true
console.log(_.lt(3, 3)); // false
console.log(_.lt(3, 1)); // false1 < 3 → true.3 < 3 is false — not less.3 < 1 → false.lt vs lteEquals pass only with less-or-equal.
console.log(_.lt(3, 3)); // false
console.log(_.lte(3, 3)); // truetrue.lte.gt vs gte on the other side.Both-string pairs use lexicographic UTF-16 order.
console.log(_.lt("a", "b")); // true
console.log(_.lt("b", "a")); // false
console.log(_.lt("10", "9")); // true // "1" < "9""a" comes before "b" → true."b" < "a" → false."10" vs "9" is not numeric — first char "1" beats "9" as “less”.Number (or _.toNumber) before comparing numeric strings.NaN Comparisons Are Always FalseOrdered compares involving NaN never succeed.
console.log(_.lt(NaN, 1)); // false
console.log(_.lt(1, NaN)); // false
console.log(_.lt(NaN, NaN)); // falseNaN < x is always false.NaN fails the check.NaN identity use _.eq.Number.isFinite before ordered compares.Use _.lt as a named predicate with _.filter.
var scores = [10, 25, 18, 30];
var low = _.filter(scores, function (n) {
return _.lt(n, 20);
});
console.log(low); // [10, 18]n < 20.10 and 18 succeed.25 and 30 fail._.lt is a Lodash 3.9+ / 4.x Lang helper. It runs anywhere Lodash runs — modern browsers (via CDN or bundle) and Node.js / Bun / Deno with npm install lodash. Native engines already have <; Lodash provides a function form for composition.
Available in [email protected] full builds and the lodash/lt 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 lt from "lodash/lt" for smaller builds. Named less-than helper for filters and composition.
Check whether one value is less than or equal to another.
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