ES proposal: Boolean.parse

Boolean.parse.md

Boolean.parse(string)

Specification

Parses the string argument as a boolean. The boolean returned represents the value true if the string argument is not null and is equal, ignoring case, to the string "true".

When the Boolean.parse function is called with a string argument the following steps are taken:

1. If Type(string) is not "string"
   • Return false
2. Let normalizedString be the result of applying String.prototype.toLowerCase on the string
3. If normalizedString is "true"
   • Return true
4. Return false

Examples

Boolean.parse('true'); // true
Boolean.parse('false'); // false

// In contrast with problematic:
Boolean('false'); // true

Use-case

Storages which doesn't support actual boolean values at serialization, and only have string-based value types. Example: Node's env arguments.

Thanks guys, all are valid points. In the original es-discuss thread, I made truthy/falsey values. Initially Boolean.parseBoolean(1) would result true, and Boolean.parseBoolean(0) would result false. But then reduced it to Java's appropriate Boolean.parseBoolean method.

EDIT: update to Boolean.parse.

Examples are still using parseBoolean instead of parse

@lahmatiy, thanks, fixed!