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ericsoco/gist:72538faae3587fe117c5f094248bb79c

Created August 24, 2018 05:38
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Immutable splice (Javascript / ES6)
Raw
gistfile1.txt
const merge = (arr, val, i) => [
...arr.slice(0, i),
val,
...arr.slice(i + 1)
];
const arr1 = ['a', 'b'];
console.log(merge(arr1, 'foo', 1));
console.log(merge(arr1, 'foo', 0));
console.log(merge(arr1, 'foo', 2));
console.log(arr1);
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