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| 29 | <h1>Source: logic/index.js</h1>
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| 31 | <article>
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| 32 | <pre class="prettyprint linenums"><code>/** @module logic **/
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| 33 | const { curry } = require('../fp');
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| 34 |
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| 35 | /** Will evaluate the first function, if it throws any exception will evaluate the second one.
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| 36 | * @argument {Function} mainFn function to be executed.
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| 37 | * @argument {Function|*} failOver function or value to fail over if first one fails.
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| 38 | * @returns {Function} excepting to receive fn arguments.
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| 39 | * @example
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| 40 | * const jsonOr = either(parse.JSON,value => `Cannot parse ${value} as json`)
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| 41 | * jsonOr(null) // -> "Cannot parse null as json"
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| 42 | * @example
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| 43 | * const jsonOr = either(parse.JSON,33)
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| 44 | * jsonOr(null) // -> 33
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| 45 | * jsonOr('{"a":1}') // -> {a:1}
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| 46 | * @method
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| 47 | */
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| 48 | const either = (mainFn, failOver) => (...arg) => {
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| 49 | try {
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| 50 | return mainFn(...arg);
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| 51 | } catch (e) {
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| 52 | return fnOrValue(failOver, e);
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| 53 | }
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| 54 | };
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| 55 | /** Given a value that can be a function if it's a function we call it passing the data to it
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| 56 | * if not we just return it
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| 57 | * @argument {Function|*} fnOrVal a function or any value
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| 58 | * @arugment {*} data any kind of data
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| 59 | * @example
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| 60 | * fnOrValue(3,4) // -> 3
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| 61 | * fnOrValue(4,null) // -> 4
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| 62 | * fnOrValue(x => x+1,4) // -> 5
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| 63 | * fnOrValue(x => x*2,4) // -> 8
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| 64 | * @returns {*}
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| 65 | * @method
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| 66 | */
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| 67 | const fnOrValue = curry((fnOrVal, data) => (typeof fnOrVal === 'function' ? fnOrVal(data) : fnOrVal));
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| 68 | /** Function that returns the passed value
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| 69 | * @argument {*} x any value
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| 70 | * @returns {*} any value
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| 71 | * @example
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| 72 | * [1,2].map(identity) // -> [1,2]
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| 73 | * @method
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| 74 | */
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| 75 | const identity = x => x;
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| 76 | /** Function that negates any passed function value
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| 77 | * @argument {Function} fn function to be negated
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| 78 | * @returns {Boolean} negated boolean value
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| 79 | * @example
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| 80 | * const isNumber = not(isNaN)
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| 81 | * isNumber(33) // -> true
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| 82 | * @method
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| 83 | */
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| 84 | const not = fn => (...args) => !fn(...args);
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| 85 |
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| 86 | module.exports = { either, fnOrValue, identity, not };
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| 87 | </code></pre>
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