CODEWITHSUNDEEP
javascript
vitto
vitto

Reputation: 19476

typeof number + typeof number = NaN?

Why this is NaN in JavaScript?

alert(typeof settings.mouse.x + ' --- ' + typeof getScalePercent((bg_w - a_w)/2, settings.bg.perc_position));
// alerts: number --- number

var pos_x = settings.mouse.x - getScalePercent((bg_w - a_w)/2, settings.bg.perc_position);    
alert(pos_x);
// alerts: NaN

// this syntax because a jQuery plug-in
var getScalePercent = function (value, perc) {
    return value * perc / 100;
}

// settings.mouse.x == 102 basically an integer
// getScalePercent(...) == 10 or 12.0390394028 basically an number

alert(settings.mouse.x + ' (' + typeof settings.mouse.x + ') --- ' + getScalePercent(((bg_w - a_w)/2), settings.bg.perc_position) + '(' + typeof getScalePercent(((bg_w - a_w)/2), settings.bg.perc_position) + ')');
// returns 102 (number) --- 12.000340563 (number)

Where I'm wrong?

Upvotes: 0

Views: 422

Answers (1)

ysrb
ysrb

Reputation: 6740

My guess is that getScalePercent is returning NaN . Since typeof NaN is returning number. Check the function whether it does what you expect to do.

Upvotes: 3

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