API: Array
arrShuffle JavaScriptDart
Shuffle the order of the given array and return.
Parameters
array::any[]
Returns
any[]
Examples
_.arrShuffle([1, 2, 3, 4]); // Returns [4, 2, 3, 1]arrWithDefault JavaScriptDart
Initialize an array with a default value of a specific length.
Parameters
defaultValue::anylength::number || 0
Returns
any[]
Examples
_.arrWithDefault('abc', 4); // Returns ['abc', 'abc', 'abc', 'abc']
_.arrWithDefault(null, 3); // Returns [null, null, null]arrWithNumber JavaScriptDart
Creates and returns an Array in the order of start...end values.
Parameters
start::numberend::number
Returns
number[]
Examples
_.arrWithNumber(1, 3); // Returns [1, 2, 3]
_.arrWithNumber(0, 3); // Returns [0, 1, 2, 3]arrUnique JavaScriptDart
Remove duplicate values from array and two-dimensional array data. In the case of 2d arrays, json type data duplication is not removed.
Parameters
array::any[]
Returns
any[]
Examples
_.arrUnique([1, 2, 2, 3]); // Returns [1, 2, 3]
_.arrUnique([[1], [1], [2]]); // Returns [[1], [2]]average JavaScriptDart
Returns the average of all numeric values in an array.
Parameters
array::number[]
Returns
number
Examples
_.average([1, 5, 15, 50]); // Returns 17.75arrMove JavaScriptDart
Moves the position of a specific element in an array to the specified position. (Position starts from 0.)
Parameters
array::any[]from::numberto::number
Returns
any[]
Examples
_.arrMove([1, 2, 3, 4], 1, 0); // Returns [2, 1, 3, 4]arrTo1dArray JavaScriptDart
Merges all elements of a multidimensional array into a one-dimensional array.
Parameters
array::any[]
Returns
any[]
Examples
_.arrTo1dArray([1, 2, [3, 4]], 5); // Returns [1, 2, 3, 4, 5]arrRepeat JavaScriptDart
Repeats the data of an Array or Object a specific number of times and returns it as a 1d array.
Parameters
array::any[]|objectcount::number
Returns
any[]
Examples
_.arrRepeat([1, 2, 3, 4], 3); // Returns [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]
_.arrRepeat({ a: 1, b: 2 }, 2); // Returns [{ a: 1, b: 2 }, { a: 1, b: 2 }]arrCount JavaScript
Returns the number of duplicates for each unique value in the given array. The array values can only be of type String or Number.
Parameters
array::string[]|number[]count::number
Returns
object
Examples
_.arrCount(['a', 'a', 'a', 'b', 'c', 'b', 'a', 'd']); // Returns { a: 4, b: 2, c: 1, d: 1 }sortByObjectKey JavaScript
Sort array values by a specific key value in an array containing multiple objects. It does not affect the order or value of elements within an object.
If the numerically option is true, when sorting an array consisting of strings, it sorts first by the numbers contained in the strings, not by their names.
Parameters
array::any[]key::stringdescending::booleannumerically::boolean
Returns
any[]
Examples
const obj = [
{
aa: 1,
bb: 'aaa',
cc: 'hi1'
},
{
aa: 4,
bb: 'ccc',
cc: 'hi10'
},
{
aa: 2,
bb: 'ddd',
cc: 'hi2'
},
{
aa: 3,
bb: 'bbb',
cc: 'hi11'
}
];
_.sortByObjectKey(obj, 'aa');
/*
[
{
aa: 1,
bb: 'aaa',
cc: 'hi1'
},
{
aa: 2,
bb: 'ddd',
cc: 'hi2'
},
{
aa: 3,
bb: 'bbb',
cc: 'hi11'
},
{
aa: 4,
bb: 'ccc',
cc: 'hi10'
}
]
*/sortNumeric JavaScript
When sorting an array consisting of strings, it sorts first by the numbers contained in the strings, not by their names. For example, given the array ['1-a', '100-a', '10-a', '2-a'], it returns ['1-a', '2-a', '10-a', '100-a'] with the smaller numbers at the front.
Parameters
array::string[]descending::boolean
Returns
string[]
Examples
_.sortNumeric(['a1a', 'b2a', 'aa1a', '1', 'a11a', 'a3a', 'a2a', '1a']);
// Returns ['1', '1a', 'a1a', 'a2a', 'a3a', 'a11a', 'aa1a', 'b2a']arrGroupByMaxCount JavaScript
Separates the data in the given array into a two-dimensional array containing only the maximum number of elements. For example, if you have an array of 6 data in 2 groups, this function will create a 2-dimensional array with 3 lengths.
Parameters
array::any[]maxLengthPerGroup::number
Returns
any[]
Examples
_.arrGroupByMaxCount(['a', 'b', 'c', 'd', 'e'], 2);
// Returns [['a', 'b'], ['c', 'd'], ['e']]