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Commit1526e42

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Added Simple Hash & Better Hash to Hash Table 🎨
1 parent42857b1 commit1526e42

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2 files changed

+94
-0
lines changed

2 files changed

+94
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lines changed

‎examples/datastructures/hash-table.js

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classHashTable{
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constructor(){
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this.table=newArray(137);
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}
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simpleHash(word){
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lettotal=0;
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for(leti=0;i<word.length;i++)
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total+=word.charCodeAt(i);
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returntotal%this.table.length;
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}
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betterHash(word){
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lettotal=0;
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for(leti=0;i<word.length;i++)
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total=37*total+word.charCodeAt(i);
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returntotal%this.table.length;
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}
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put(value,whichHash){
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letpos;
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if(whichHash=="simpleHash")
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pos=this.simpleHash(value);
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if(whichHash=="betterHash")
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pos=this.betterHash(value);
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this.table[pos]=value;
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}
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get(value,whichHash){
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lethash;
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if(whichHash=="simpleHash")
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hash=this.simpleHash(value);
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if(whichHash=="betterHash")
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hash=this.betterHash(value);
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returnthis.table[hash];
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}
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showAll(){
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letstr="";
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for(leti=0;i<this.table.length;i++)
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if(this.table[i]!=undefined)
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str+=i+" : "+this.table[i]+"\n";
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returnstr;
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}
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}
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module.exports=HashTable;
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constexpect=require('chai').expect;
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constHashTable=require('../../examples/datastructures/hash-table');
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describe('=> HASH TABLE',function(){
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letnames;
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before(function(){
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names=newHashTable();
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});
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it('should create an Empty Hash Table',function(done){
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expect(names.table).to.deep.equal([]);
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done();
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});
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describe('=> simpleHash',function(){
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before(function(){
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names=newHashTable();
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});
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it('should put only 1 value of "Clayton" & "Raymond" in Hash Table bcz of Simple Hash',function(done){
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names.put("Clayton","simpleHash");
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names.put("Raymond","simpleHash");
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expect(names.showAll()).to.equal("45 : Raymond\n");
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done();
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});
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after(function(){
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names=newHashTable();
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});
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});
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describe('=> betterHash',function(){
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it('should put both values of "Clayton" & "Raymond" in Hash Table bcz of Simple Hash',function(done){
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names.put("Clayton","betterHash");
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names.put("Raymond","betterHash");
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expect(names.showAll()).to.equal("88 : Clayton\n92 : Raymond\n");
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done();
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});
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});
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it('should get value from Hash Table',function(){
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names.put("New","betterHash");
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expect(names.get("New","betterHash")).to.equal("New");
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expect(names.get("xxx","betterHash")).to.equal(undefined);
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});
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});

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