map - nodef/extra-entries GitHub Wiki
Transform values of entries.
function map(x, fm)
// x: entries
// fm: map function (v, k, x)
const entries = require('extra-entries');
var x = ["a", 1], ["b", 2], ["c", 3], ["d", 4](/nodef/extra-entries/wiki/"a",-1],-["b",-2],-["c",-3],-["d",-4);
[...entries.map(x, v => v * 2)];
// → [ [ "a", 2 ], [ "b", 4 ], [ "c", 6 ], [ "d", 8 ] ]