swap - nodef/extra-array GitHub Wiki

Exchange two values.

Alternatives: swap, swap$.

function swap(x, i, j)
// x: an array
// i: an index
// j: another index

const xarray = require('extra-array');

var x = [1, 2, 3, 4];
xarray.swap(x, 0, 1);
// → [ 2, 1, 3, 4 ]

xarray.swap(x, 0, 3);
// → [ 4, 2, 3, 1 ]

References

• List-Extra.swapAt() : Elm
• Collections.swap() : Java
• pure-swap : @alferov
• std::swap(std::list) : cppreference.com