Benchmark: count number of chars in a string 2

Tests:

regex
("this is foo bar".match(/o/g)||[]).length
split
"this is foo bar".split("o").length-1
for loop1
var stringsearch = "o"; var str = "this is foo bar"; for(var count=-1,index=-2; index != -1; count++,index=str.indexOf(stringsearch,index+1) );
for loop 2
var stringsearch = "o"; var str = "this is foo bar"; for(var i=count=0; i<str.length; count+=+(stringsearch===str[i++]));
deleting
var str = "this is foo bar"; str.length - str.replace(/o/g,'').length;
histogram
var str = "this is foo bar"; var schar = 'o'; var hist={}; for(si in str){ hist[str[si]] = hist[str[si]] ? 1+hist[str[si]]:1; }
for in
var str = "this is foo bar"; var char = 'o'; var count = 0; for (let c in str) { if (str[c] === char) count++; }

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count number of chars in a string 2 (version: 0)