negate - nodef/extra-function GitHub Wiki

Generate a result-negated version of a function.

function negate(x)
// x: a function

const xfunction = require('extra-function');


var fn = xfunction.negate(isFinite);
fn(Infinity)
// → true
fn(1)
// → false

var fn = xfunction.negate(isNaN);
fn(1);
// → true
fn(NaN);
// → false

References

• negate: Underscore.js documentation
• Learn You a Haskell for Great Good!: Higher order functions by Miran Lipovaca