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39 lines
1.4 KiB
TypeScript
39 lines
1.4 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/when.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 satisfied, the function will return the result of calling
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* the `whenTrueFn` function with the same argument. If the predicate is not
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* 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} whenTrueFn A function to invoke when the `condition`
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* evaluates to a truthy value.
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* @param {*} x An object to test with the `pred` function and
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* pass to `whenTrueFn` if necessary.
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* @return {*} Either `x` or the result of applying `x` to `whenTrueFn`.
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* @see R.ifElse, R.unless, R.cond
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* @example
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*
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* // truncate :: String -> String
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* const truncate = R.when(
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* R.propSatisfies(R.gt(R.__, 10), 'length'),
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* R.pipe(R.take(10), R.append('…'), R.join(''))
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* );
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* truncate('12345'); //=> '12345'
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* truncate('0123456789ABC'); //=> '0123456789…'
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*/
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var when = _curry3(function when(pred, whenTrueFn, x) {
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return pred(x) ? whenTrueFn(x) : x;
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});
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export default when;
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