count

Count value(number, string, array, object...).

Installation

$ npm i --save @cwola/count

require / import

• esm

  import count from '@cwola/count';

• commonjs

  const count = require('@cwola/count');

API

count(val: any, recursive: boolean = false): number

• Return

  | Input | Return | |---|---| | null | 0 | | undefined | 0 | | NaN | 0 | | Infinity | 1 | | Symbol | 1 | | number | Math.abs(number) | | string | string.length | | boolean | 1 | | array, array-like (recursive = false) | array.length | | array, array-like (recursive = true) | Count the Number of Key (recursive) | | object (recursive = false) | Object.keys(object).length | | object (recursive = true) | Count the Number of Key (recursive) | | Countable class | class.count() | | other (e.g. Function) | 1 |

Test

// esm
import count from '@cwola/count';
import assert from 'assert';

assert.equal(0, count(null));
assert.equal(0, count(undefined));
assert.equal(0, count(NaN));
assert.equal(1, count(Infinity));
assert.equal(1, count(Symbol('symbol')));
assert.equal(0, count(0));
assert.equal(3, count(3));
assert.equal(145, count(145));
assert.equal(145, count(-145));
assert.equal(10, count('I\'m cwola.'));
assert.equal(10, count('私はcwolaです。'));
assert.equal(1, count(true));
assert.equal(1, count(false));
assert.equal(1, count(() => {}));
assert.equal(8, count(new Uint8Array(8)));

// countable
class Countable {
    count() {
        return 5;
    }
}
assert.equal(5, count(new Countable));

// array
let o = [1, 2, 3];
assert.equal(3, count(o));
o[99] = 100;
assert.equal(100, count(o));
o = [1, 2, 'I\'m cwola.', new Countable, false, null, undefined];
assert.equal(7, count(o));

// object
o = {a:1, b:2, c:3};
assert.equal(3, count(o));


// recursive
o = [1, 2, 3, [4, 5, [6, 7]], 8, 9];
assert.equal(6, count(o));
assert.equal(11, count(o, true));

o = {a:1, b:2, c:3, d:{e:5, f:[7, 8]}};
assert.equal(4, count(o));
assert.equal(8, count(o, true));

License

MIT