mocoolka-function/lib/unless.js

Function lib for function.

Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Tests the final argument by passing it to the given predicate function. If
 * the predicate is not satisfied, the function will return the result of
 * calling the `whenFalseFn` function with the same argument. If the predicate
 * is satisfied, the argument is returned as is.
 *

 * @since v0.1.0
 * @param {Function} pred        A predicate function
 * @param {Function} whenFalseFn A function to invoke when the `pred` evaluates
 *                               to a falsy value.
 * @param {*}        x           An object to test with the `pred` function and
 *                               pass to `whenFalseFn` if necessary.
 * @return {*} Either `x` or the result of applying `x` to `whenFalseFn`.
 * @example
 *
 *      let safeInc = _unless(R.isNil, R.inc);
 *      safeInc(null); //=> null
 *      safeInc(1); //=> 2
 */
var unless = function (pred, whenFalseFn, x) { return pred(x) ? x : whenFalseFn(x); };
exports.default = unless;
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