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Less than or equal

The less than or equal operator (<=) returns true if the left operand is less than or equal to the right operand, and false otherwise.

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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Less than or equal (a <= b) 1 12 1 3 3 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Less than or equal (a <= b) 1 18 4 10.1 1 1.0
Server
Node.js
Less than or equal (a <= b) 0.1.100

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Less_than_or_equal