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42 lines
1.5 KiB
42 lines
1.5 KiB
/**
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* Produces a duplicate-free version of the array, using === to test object equality. In particular only the first
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* occurrence of each value is kept. If you want to compute unique items based on a transformation, pass an iteratee
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* function.
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* Heavily inspired by https://underscorejs.org/#uniq
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* @param {Array} array
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* @param {function} [iteratee] transformation applied to every element before checking for duplicates. This will not
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* transform the items in the result.
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* @return {Array}
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*/
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const uniq = (array, iteratee) => {
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if (iteratee) return [...(new Map(array.map(x => [iteratee(x), x]))).values()]
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else return [...new Set(array)]
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}
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/**
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* Returns true if arg is an Object. Note that JavaScript arrays and functions are objects, while (normal) strings
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* and numbers are not.
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* Heavily inspired by https://underscorejs.org/#isObject
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* @param {*} arg
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* @return {boolean}
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*/
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const isObject = arg => typeof arg === 'object' && arg !== null
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/**
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* Returns true if d is a Date.
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* Heavily inspired by https://underscorejs.org/#isDate
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* @param {*} d
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* @return {boolean}
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*/
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const isDate = d => isObject(d) && Object.prototype.toString.call(d) === '[object Date]'
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/**
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* Returns true if re is a RegExp.
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* Heavily inspired by https://underscorejs.org/#isRegExp
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* @param {*} re
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* @return {boolean}
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*/
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const isRegExp = re => isObject(re) && Object.prototype.toString.call(re) === '[object RegExp]'
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module.exports.uniq = uniq
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module.exports.isDate = isDate
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module.exports.isRegExp = isRegExp
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