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30secondsofcode
2018-07-18 19:44:15 +00:00
parent 2fc7529f5b
commit 63c5de375f
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@ -1487,6 +1487,26 @@
"hash": "8f319457b4350e041ba31cd4b4d02135013d8ea6716d0a4d00cf1b1bfd214ffa"
}
},
{
"id": "filterNonUniqueBy",
"type": "snippet",
"attributes": {
"fileName": "filterNonUniqueBy.md",
"text": "Filters out the non-unique values in an array, based on a provided comparator function.\n\nUse `Array.filter()` and `Array.every()` for an array containing only the unique values, based on the comparator function, `fn`.\nThe comparator function takes four arguments: the values of the two elements being compared and their indexes.",
"codeBlocks": [
"const filterNonUniqueBy = (arr, fn) =>\n arr.filter((v, i) => arr.every((x, j) => (i == j) == fn(v, x, i, j)));",
"filterNonUniqueBy(\n [\n { id: 0, value: 'a' },\n { id: 1, value: 'b' },\n { id: 2, value: 'c' },\n { id: 1, value: 'd' },\n { id: 0, value: 'e' }\n ],\n (a, b) => a.id == b.id\n); // [ { id: 2, value: 'c' } ]"
],
"tags": [
"array",
"function"
]
},
"meta": {
"archived": false,
"hash": "617e1a689baf11f30c1922cdd94bd7c3b4457aa97c60dcac81b7b2906620cbda"
}
},
{
"id": "findKey",
"type": "snippet",
@ -5959,6 +5979,46 @@
"hash": "e45f1af52564b0b1d91ce8bce53fe98ce888f3c943e1c1828682893393540256"
}
},
{
"id": "uniqueElementsBy",
"type": "snippet",
"attributes": {
"fileName": "uniqueElementsBy.md",
"text": "Returns all unique values of an array, based on a provided comparator function.\n\nUse `Array.reduce()` and `Array.some()` for an array containing only the first unique occurence of each value, based on the comparator function, `fn`.\nThe comparator function takes two arguments: the values of the two elements being compared.",
"codeBlocks": [
"const uniqueElementsBy = (arr, fn) =>\n arr.reduce((acc, v) => {\n if (!acc.some(x => fn(v, x))) acc.push(v);\n return acc;\n }, []);",
"uniqueElementsBy(\n [\n { id: 0, value: 'a' },\n { id: 1, value: 'b' },\n { id: 2, value: 'c' },\n { id: 1, value: 'd' },\n { id: 0, value: 'e' }\n ],\n (a, b) => a.id == b.id\n); // [ { id: 0, value: 'a' }, { id: 1, value: 'b' }, { id: 2, value: 'c' } ]"
],
"tags": [
"array",
"function"
]
},
"meta": {
"archived": false,
"hash": "8640aeb79ced5defcc89555176a88acd66bca74f4359dc41388b5687f2050015"
}
},
{
"id": "uniqueElementsByRight",
"type": "snippet",
"attributes": {
"fileName": "uniqueElementsByRight.md",
"text": "Returns all unique values of an array, based on a provided comparator function.\n\nUse `Array.reduce()` and `Array.some()` for an array containing only the last unique occurence of each value, based on the comparator function, `fn`.\nThe comparator function takes two arguments: the values of the two elements being compared.",
"codeBlocks": [
"const uniqueElementsByRight = (arr, fn) =>\n arr.reduceRight((acc, v) => {\n if (!acc.some(x => fn(v, x))) acc.push(v);\n return acc;\n }, []);",
"uniqueElementsByRight(\n [\n { id: 0, value: 'a' },\n { id: 1, value: 'b' },\n { id: 2, value: 'c' },\n { id: 1, value: 'd' },\n { id: 0, value: 'e' }\n ],\n (a, b) => a.id == b.id\n); // [ { id: 0, value: 'e' }, { id: 1, value: 'd' }, { id: 2, value: 'c' } ]"
],
"tags": [
"array",
"function"
]
},
"meta": {
"archived": false,
"hash": "853887ad00b7c39a719c5b7e16dd3464a85f08da43d9d1bd1e7b7ebeaa897c95"
}
},
{
"id": "untildify",
"type": "snippet",