In JavaScript, a truthy value is a value that is considered true
when encountered in a Boolean context. All values are truthy unless they are defined as falsy (i.e., except for false
, 0
, -0
, 0n
, ""
, null
, undefined
, and NaN
).
JavaScript uses type coercion in Boolean contexts.
Examples of truthy values in JavaScript (which will be coerced to true in boolean contexts, and thus execute the if
block):
if (true) if ({}) if ([]) if (42) if ("0") if ("false") if (new Date()) if (-42) if (12n) if (3.14) if (-3.14) if (Infinity) if (-Infinity)
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of ' ToBoolean abstract operation' in that specification. |