map-utils
works with great with Array.map
exists
return true for any value other than ull or undefined
var utils = require('map-utils');
utils.exists(null); // false
utils.exists(undefined); // false
utils.exists('foo'); // true
pick
accepts keys and returns a function which accepts an object and return a new object with the keys specified
var utils = require('map-utils');
var arr = [
{
foo: 1,
bar: 1,
qux: 1
},
{
foo: 2,
bar: 2,
qux: 2
}
];
arr.map(utils.pick('foo', 'bar'));
/*
[
{
foo: 1,
bar: 1
},
{
foo: 2,
bar: 2
}
]
*/
omit
accepts keys and returns a function which accepts an object and returns a new object without the keys specified
var utils = require('map-utils');
var arr = [
{
foo: 1,
bar: 1,
qux: 1
},
{
foo: 2,
bar: 2,
qux: 2
}
];
arr.map(utils.omit('foo', 'bar'));
/*
[
{
qux: 1
},
{
qux: 2
}
]
*/
pluck
accepts keys and returns a function which accepts an object and returns the value of the key specified
var utils = require('map-utils');
var arr = [
{
foo: 1,
bar: 1,
qux: 1
},
{
foo: 2,
bar: 2,
qux: 2
}
];
arr.map(utils.pluck('foo')); // [1, 2]
set
accepts obj or key val arguments and returns a function which accepts an object which those key/values will be set on
var utils = require('map-utils');
var arr1 = [
{
foo: 1,
bar: 1
},
{
foo: 2,
bar: 1
}
];
var arr2 = [
{
foo: 1
},
{
foo: 2
}
];
arr1.map(utils.set('qux', 1));
arr2.map(utils.set({ bar:1, qux:1 }));
/* both arr and arr2 becom:
[
{
foo: 1,
bar: 1,
qux: 1
},
{
foo: 2,
bar: 1,
qux: 1
}
]
*/
unset
accepts keys and returns a function which accepts an object which those keys will be deleted from
var utils = require('map-utils');
var arr = [
{
foo: 1,
bar: 1,
qux: 1
},
{
foo: 2,
bar: 2,
qux: 2
}
];
arr.map(utils.unset('foo', 'bar'));
/* arr becomes:
[
{
foo: 1,
bar: 1
},
{
foo: 2,
bar: 2
}
]
*/