| 1 | ;
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| 2 | /**
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| 3 | * Returns a function that checks whether a value is equal to one of allowed values
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| 4 | * Function compares values using === operator
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| 5 | *
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| 6 | * @function oneOf
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| 7 | *
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| 8 | * @example
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| 9 | * var is = require('predicates');
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| 10 | *
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| 11 | * var isAllowedToAccess = is.oneOf('ROLE_ADMIN', 'ROLE_USER');
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| 12 | * // same as
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| 13 | * // var isAllowedToAccess = is.in(['ROLE_ADMIN', 'ROLE_USER']);
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| 14 | *
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| 15 | * isAllowedToAccess('ROLE_ADMIN'); // true
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| 16 | * isAllowedToAccess('ROLE_ANONYMOUS'); // false
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| 17 | *
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| 18 | * @param {...*} allowedValue
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| 19 | * @throws {Error} if 0 or 1 allowed value provided
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| 20 | * @returns {Predicate}
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| 21 | */
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| 22 | module.exports = function isOneOf() {
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| 23 | var allowedValues = Array.prototype.slice.call(arguments);
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| 24 |
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| 25 | if (allowedValues.length < 2) {
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| 26 | throw new Error('At least 2 allowed values are required');
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| 27 | }
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| 28 |
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| 29 | return function isOneOfPredicate(value) {
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| 30 | return allowedValues.indexOf(value) !== -1;
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| 31 | };
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| 32 | };
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