Fivenum: Difference between revisions

</pre>

=={{header|JavaScript}}==

<lang javascript>

function median(arr) {

let mid = Math.floor(arr.length / 2);

return (arr.length % 2 == 0) ? (arr[mid-1] + arr[mid]) / 2 : arr[mid];

}

Array.prototype.fiveNums = function() {

this.sort(function(a, b) { return a - b} );

let mid = Math.floor(this.length / 2),

loQ = (this.length % 2 == 0) ? this.slice(0, mid) : this.slice(0, mid+1),

hiQ = this.slice(mid);

return [ this[0],

median(loQ),

median(this),

median(hiQ),

this[this.length-1] ];

}

// testing

let test = [15, 6, 42, 41, 7, 36, 49, 40, 39, 47, 43];

console.log( test.fiveNums() );

test = [0, 0, 1, 2, 63, 61, 27, 13];

console.log( test.fiveNums() );

test = [ 0.14082834, 0.09748790, 1.73131507, 0.87636009, -1.95059594,

0.73438555, -0.03035726, 1.46675970, -0.74621349, -0.72588772,

0.63905160, 0.61501527, -0.98983780, -1.00447874, -0.62759469,

0.66206163, 1.04312009, -0.10305385, 0.75775634, 0.32566578];

console.log( test.fiveNums() );

</lang>

{{out}}<pre>

> Array(5) [ 6, 25.5, 40, 42.5, 49 ]

> Array(5) [ 0, 0.5, 7.5, 44, 63 ]

> Array(5) [ -1.95059594, -0.676741205, 0.23324706, 0.746070945, 1.73131507 ]