The less than or equal operator (<=
) returns true
if the left operand is less than or equal to the right operand, and false
otherwise.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
x <= y
Description
The operands are compared using the Abstract Relational Comparison algorithm. See the documentation for the Less than operator for a summary of this algorithm.
Examples
String to string comparison
console.log("a" <= "b"); // true console.log("a" <= "a"); // true console.log("a" <= "3"); // false
String to number comparison
console.log("5" <= 3); // false console.log("3" <= 3); // true console.log("3" <= 5); // true console.log("hello" <= 5); // false console.log(5 <= "hello"); // false
Number to Number comparison
console.log(5 <= 3); // false console.log(3 <= 3); // true console.log(3 <= 5); // true
Number to BigInt comparison
console.log(5n <= 3); // false console.log(3 <= 3n); // true console.log(3 <= 5n); // true
Comparing Boolean, null, undefined, NaN
console.log(true <= false); // false console.log(true <= true); // true console.log(false <= true); // true console.log(true <= 0); // false console.log(true <= 1); // true console.log(null <= 0); // true console.log(1 <= null); // false console.log(undefined <= 3); // false console.log(3 <= undefined); // false console.log(3 <= NaN); // false console.log(NaN <= 3); // false
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Relational operators' in that specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Less than or equal (a <= b ) | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 3 | Opera Full support 3 | Safari Full support 1 | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 10.1 | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support 0.1.100 |
Legend
- Full support
- Full support