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Travis build: 1666

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30secondsofcode
2019-12-31 09:38:53 +00:00
parent 21b0ab5c65
commit 2344523e5b
15 changed files with 93 additions and 97 deletions
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40
vscode_snippets/snippets.json
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@ -1743,8 +1743,8 @@
" i === arr.length - 2",
" ? acc + val + end",
" : i === arr.length - 1",
" ? acc + val",
" : acc + val + separator,",
" ? acc + val",
" : acc + val + separator,",
" ''",
" );"
],
@ -2073,10 +2073,10 @@
"const objectToQueryString = queryParameters => {",
" return queryParameters",
" ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {",
" const symbol = queryString.length === 0 ? '?' : '&';",
" queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';",
" return queryString;",
" }, '')",
" const symbol = queryString.length === 0 ? '?' : '&';",
" queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';",
" return queryString;",
" }, '')",
" : '';",
"};"
],
@ -2590,9 +2590,9 @@
"const remove = (arr, func) =>",
" Array.isArray(arr)",
" ? arr.filter(func).reduce((acc, val) => {",
" arr.splice(arr.indexOf(val), 1);",
" return acc.concat(val);",
" }, [])",
" arr.splice(arr.indexOf(val), 1);",
" return acc.concat(val);",
" }, [])",
" : [];"
],
"description": "Removes elements from an array for which the given function returns `false`.\n\nUse `Array.prototype.filter()` to find array elements that return truthy values and `Array.prototype.reduce()` to remove elements using `Array.prototype.splice()`.\nThe `func` is invoked with three arguments (`value, index, array`).\n"
@ -2790,10 +2790,10 @@
" Array.isArray(val)",
" ? val.length",
" : val && typeof val === 'object'",
" ? val.size || val.length || Object.keys(val).length",
" : typeof val === 'string'",
" ? new Blob([val]).size",
" : 0;"
" ? val.size || val.length || Object.keys(val).length",
" : typeof val === 'string'",
" ? new Blob([val]).size",
" : 0;"
],
"description": "Gets the size of an array, object or string.\n\nGet type of `val` (`array`, `object` or `string`). \nUse `length` property for arrays.\nUse `length` or `size` value if available or number of keys for objects.\nUse `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API/Blob) created from `val` for strings.\nSplit strings into array of characters with `split('')` and return its length.\n"
},
@ -3449,6 +3449,20 @@
],
"description": "Returns the distance between two vectors.\n\nUse `Array.prototype.reduce()`, `Math.pow()` and `Math.sqrt()` to calculate the Euclidean distance between two vectors.\n"
},
"weightedSample": {
"prefix": "30s_weightedSample",
"body": [
"const weightedSample = (arr, weights) => {",
" let roll = Math.random();",
" return arr[",
" weights",
" .reduce((acc, w, i) => (i === 0 ? [w] : [...acc, acc[acc.length - 1] + w]), [])",
" .findIndex((v, i, s) => roll >= (i === 0 ? 0 : s[i - 1]) && roll < v)",
" ];",
"};"
],
"description": "Returns a random element from an array, using the provided `weights` as the probabilities for each element.\n\nUse `Array.prototype.reduce()` to create an array of partial sums for each value in `weights`.\nUse `Math.random()` to generate a random number and `Array.prototype.findIndex()` to find the correct index based on the array previously produced.\nFinally, return the element of `arr` with the produced index.\n\n"
},
"when": {
"prefix": "30s_when",
"body": [