Commit 4450ccad authored by Thonier Florian's avatar Thonier Florian Committed by Mathieu Giraud

tools.js: add a function to compare array equality

Link to #3945
parent b853051b
......@@ -714,6 +714,39 @@ function openAndFillNewTab (content){
* Function that allow to make comparison between two arrays.
console.warn("Overriding existing Array.prototype.equals. Possible causes: New API defines the method, there's a framework conflict or you've got double inclusions in your code.");
// attach the .equals method to Array's prototype to call it on any array
Array.prototype.equals = function (array) {
// if the other array is a falsy value, return
if (!array)
return false;
// compare lengths - can save a lot of time
if (this.length != array.length)
return false;
for (var i = 0, l=this.length; i < l; i++) {
// Check if we have nested arrays
if (this[i] instanceof Array && array[i] instanceof Array) {
// recurse into the nested arrays
if (!this[i].equals(array[i]))
return false;
else if (this[i] != array[i]) {
// Warning - two different object instances will never be equal: {x:20} != {x:20}
return false;
return true;
// Hide method from for-in loops
Object.defineProperty(Array.prototype, "equals", {enumerable: false});
* @param {data} a string containing a multi-FASTA
* @param {n} the number of sequences to keep
......@@ -728,3 +761,5 @@ function getNFirstSequences(data, n) {
return data;
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