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35 lines
1.2 KiB
TypeScript
35 lines
1.2 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/unless.js
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import _curry3 from './internal/_curry3.js';
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/**
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* Tests the final argument by passing it to the given predicate function. If
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* the predicate is not satisfied, the function will return the result of
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* calling the `whenFalseFn` function with the same argument. If the predicate
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* is satisfied, the argument is returned as is.
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*
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* @func
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* @memberOf R
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* @since v0.18.0
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* @category Logic
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* @sig (a -> Boolean) -> (a -> a) -> a -> a
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* @param {Function} pred A predicate function
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* @param {Function} whenFalseFn A function to invoke when the `pred` evaluates
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* to a falsy value.
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* @param {*} x An object to test with the `pred` function and
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* pass to `whenFalseFn` if necessary.
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* @return {*} Either `x` or the result of applying `x` to `whenFalseFn`.
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* @see R.ifElse, R.when, R.cond
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* @example
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*
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* let safeInc = R.unless(R.isNil, R.inc);
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* safeInc(null); //=> null
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* safeInc(1); //=> 2
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*/
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var unless = _curry3(function unless(pred, whenFalseFn, x) {
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return pred(x) ? x : whenFalseFn(x);
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});
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export default unless;
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