Has the same functionality as Array.prototype.splice()
, but returning a new array instead of mutating the original array.
Use Array.prototype.slice()
and Array.prototype.concat()
to get a new array with the new contents after removing existing elements and/or adding new elements.
Omit the second argument, index
, to start at 0
.
Omit the third argument, delCount
, to remove 0
elements.
Omit the fourth argument, elements
, in order to not add any new elements.
代码片段
const shank = (arr, index = 0, delCount = 0, ...elements) =>
arr
.slice(0, index)
.concat(elements)
.concat(arr.slice(index + delCount));
使用样例
const names = ['alpha', 'bravo', 'charlie'];
const namesAndDelta = shank(names, 1, 0, 'delta'); // [ 'alpha', 'delta', 'bravo', 'charlie' ]
const namesNoBravo = shank(names, 1, 1); // [ 'alpha', 'charlie' ]
console.log(names); // ['alpha', 'bravo', 'charlie']