ES6 introduces Array.prototype.fill. It can be used like this: new Array(len).fill(0); Not sure if it’s fast, but I like it because it’s short and self-describing. It’s still not in IE (check compatibility), but there’s a polyfill available.
Array(5) gives you an array with length 5 but no values, hence you can’t iterate over it. Array.apply(null, Array(5)).map(function () {}) gives you an array with length 5 and undefined as values, now it can be iterated over. Array.apply(null, Array(5)).map(function (x, i) { return i; }) gives you an array with length 5 and values … Read more
Depending on the encoding you wish to use: var str = System.Text.Encoding.Default.GetString(result);
2019 Update Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more info. You can use reset and key: reset($array); $first_key = key($array); It’s essentially the same as your initial code, … Read more
Use numpy.set_printoptions: import sys import numpy numpy.set_printoptions(threshold=sys.maxsize)
If you want to avoid external libraries, you can concisely implement a vanilla version of groupBy() like so: var groupBy = function(xs, key) { return xs.reduce(function(rv, x) { (rv[x[key]] = rv[x[key]] || []).push(x); return rv; }, {}); }; console.log(groupBy([‘one’, ‘two’, ‘three’], ‘length’)); // => {3: [“one”, “two”], 5: [“three”]}
As of ECMAScript 2016 you can use includes() arr.includes(obj); If you want to support IE or other older browsers: function include(arr,obj) { return (arr.indexOf(obj) != -1); } EDIT: This will not work on IE6, 7 or 8 though. The best workaround is to define it yourself if it’s not present: Mozilla’s (ECMA-262) version: if (!Array.prototype.indexOf) … Read more
These are the current declaration and initialization methods for a simple array. string[] array = new string[2]; // creates array of length 2, default values string[] array = new string[] { “A”, “B” }; // creates populated array of length 2 string[] array = { “A” , “B” }; // creates populated array of length … Read more
IFS=’, ‘ read -r -a array <<< “$string” Note that the characters in $IFS are treated individually as separators so that in this case fields may be separated by either a comma or a space rather than the sequence of the two characters. Interestingly though, empty fields aren’t created when comma-space appears in the input … Read more
The array.slice() method can extract a slice from the beginning, middle, or end of an array for whatever purposes you require, without changing the original array. const chunkSize = 10; for (let i = 0; i < array.length; i += chunkSize) { const chunk = array.slice(i, i + chunkSize); // do whatever } The last … Read more