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the murmurous sea
JS ES5: filter 본문
1. method
2. creates a new array filled with all array elements that pass a test (provided as a function).
3. does not execute the function for array elements without values.
4. does not change the original array.
[Syntax]
let newArray = arr.filter(callback(element[, index, [array]])[, thisArg])
▽
callback |
Required |
A function to be run for each element in the array. | |
is a predicate, to test each element of the array. Return true to keep the element, false otherwise. |
|||
function(element, index, array) | element Required The value of the current element being processed in the array. |
||
index Optional The array index of the current element being processed in the array. |
|||
array Optional. The array object the current element belongs to. The array filter was called upon. : why need this argument...? |
|||
thisArg | Optional |
A value to be passed to the function to use as its "this" value when executing callback. | |
If this parameter is empty, the value "undefined" will be passed as its "this" value |
[Return value]
: A new array containing all the array elements that pass the test.
: If no elements pass the test, an empty array will be returned.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
'#dev > 개념정리' 카테고리의 다른 글
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